diff --git a/substrate/Cargo.lock b/substrate/Cargo.lock
index 9a63e25b4878cbf492f81158c2c99e23364a4b23..4aac7f3c7ed99d235b30d2f558390795af4c36f6 100644
--- a/substrate/Cargo.lock
+++ b/substrate/Cargo.lock
@@ -8101,6 +8101,7 @@ dependencies = [
  "quickcheck",
  "rand 0.8.5",
  "sc-client-api",
+ "sc-network",
  "sc-network-common",
  "sp-api",
  "sp-authority-discovery",
@@ -8163,7 +8164,7 @@ dependencies = [
  "sc-chain-spec-derive",
  "sc-client-api",
  "sc-executor",
- "sc-network-common",
+ "sc-network",
  "sc-telemetry",
  "serde",
  "serde_json",
@@ -8751,6 +8752,7 @@ dependencies = [
  "futures-timer",
  "log",
  "sc-client-api",
+ "sc-network",
  "sc-network-common",
  "sp-blockchain",
  "sp-runtime",
@@ -8787,6 +8789,7 @@ dependencies = [
  "futures-timer",
  "ip_network",
  "libp2p",
+ "linked_hash_set",
  "log",
  "lru",
  "mockall",
@@ -8838,6 +8841,7 @@ dependencies = [
  "sc-block-builder",
  "sc-client-api",
  "sc-consensus",
+ "sc-network",
  "sc-network-common",
  "sp-blockchain",
  "sp-consensus",
@@ -8861,7 +8865,6 @@ dependencies = [
  "futures",
  "futures-timer",
  "libp2p",
- "linked_hash_set",
  "parity-scale-codec",
  "prost-build",
  "sc-consensus",
@@ -8890,6 +8893,7 @@ dependencies = [
  "log",
  "lru",
  "quickcheck",
+ "sc-network",
  "sc-network-common",
  "sc-peerset",
  "sp-runtime",
@@ -8911,6 +8915,7 @@ dependencies = [
  "prost",
  "prost-build",
  "sc-client-api",
+ "sc-network",
  "sc-network-common",
  "sc-peerset",
  "sp-blockchain",
@@ -8939,6 +8944,7 @@ dependencies = [
  "sc-block-builder",
  "sc-client-api",
  "sc-consensus",
+ "sc-network",
  "sc-network-common",
  "sc-peerset",
  "sc-utils",
@@ -8997,6 +9003,7 @@ dependencies = [
  "log",
  "parity-scale-codec",
  "pin-project",
+ "sc-network",
  "sc-network-common",
  "sc-peerset",
  "sc-utils",
@@ -9026,6 +9033,7 @@ dependencies = [
  "sc-block-builder",
  "sc-client-api",
  "sc-client-db",
+ "sc-network",
  "sc-network-common",
  "sc-peerset",
  "sc-transaction-pool",
diff --git a/substrate/bin/node/cli/src/service.rs b/substrate/bin/node/cli/src/service.rs
index e9a34b2a5c72803065369890106bb2d41cf5ee26..3c9716c08d1c0c9e0253bc8074ca9d861ef34e6e 100644
--- a/substrate/bin/node/cli/src/service.rs
+++ b/substrate/bin/node/cli/src/service.rs
@@ -31,10 +31,8 @@ use node_primitives::Block;
 use sc_client_api::BlockBackend;
 use sc_consensus_babe::{self, SlotProportion};
 use sc_executor::NativeElseWasmExecutor;
-use sc_network::NetworkService;
-use sc_network_common::{
-	protocol::event::Event, service::NetworkEventStream, sync::warp::WarpSyncParams,
-};
+use sc_network::{event::Event, NetworkEventStream, NetworkService};
+use sc_network_common::sync::warp::WarpSyncParams;
 use sc_network_sync::SyncingService;
 use sc_service::{config::Configuration, error::Error as ServiceError, RpcHandlers, TaskManager};
 use sc_telemetry::{Telemetry, TelemetryWorker};
diff --git a/substrate/client/authority-discovery/Cargo.toml b/substrate/client/authority-discovery/Cargo.toml
index b37507662bfeb17cae10e2567d2dce63d86431a5..900d9c59dfdae45ed9aac6990c189c62965b0688 100644
--- a/substrate/client/authority-discovery/Cargo.toml
+++ b/substrate/client/authority-discovery/Cargo.toml
@@ -28,6 +28,7 @@ rand = "0.8.5"
 thiserror = "1.0"
 prometheus-endpoint = { package = "substrate-prometheus-endpoint", version = "0.10.0-dev", path = "../../utils/prometheus" }
 sc-client-api = { version = "4.0.0-dev", path = "../api" }
+sc-network = { version = "0.10.0-dev", path = "../network/" }
 sc-network-common = { version = "0.10.0-dev", path = "../network/common" }
 sp-api = { version = "4.0.0-dev", path = "../../primitives/api" }
 sp-authority-discovery = { version = "4.0.0-dev", path = "../../primitives/authority-discovery" }
diff --git a/substrate/client/authority-discovery/src/lib.rs b/substrate/client/authority-discovery/src/lib.rs
index 579b9d8b150515b3bfbcc56355189b312c3582fa..a3c6699091297aa81f90396342279f022f317f88 100644
--- a/substrate/client/authority-discovery/src/lib.rs
+++ b/substrate/client/authority-discovery/src/lib.rs
@@ -40,7 +40,7 @@ use futures::{
 };
 
 use libp2p::{Multiaddr, PeerId};
-use sc_network_common::protocol::event::DhtEvent;
+use sc_network::event::DhtEvent;
 use sp_authority_discovery::AuthorityId;
 use sp_blockchain::HeaderBackend;
 use sp_runtime::traits::Block as BlockT;
diff --git a/substrate/client/authority-discovery/src/worker.rs b/substrate/client/authority-discovery/src/worker.rs
index bc5fe2848d5a1aad61927d199e0f9387dfc59e92..034d72902e65d54320d8fbed090ebae53c3180e9 100644
--- a/substrate/client/authority-discovery/src/worker.rs
+++ b/substrate/client/authority-discovery/src/worker.rs
@@ -43,9 +43,8 @@ use log::{debug, error, log_enabled};
 use prometheus_endpoint::{register, Counter, CounterVec, Gauge, Opts, U64};
 use prost::Message;
 use rand::{seq::SliceRandom, thread_rng};
-use sc_network_common::{
-	protocol::event::DhtEvent,
-	service::{KademliaKey, NetworkDHTProvider, NetworkSigner, NetworkStateInfo, Signature},
+use sc_network::{
+	event::DhtEvent, KademliaKey, NetworkDHTProvider, NetworkSigner, NetworkStateInfo, Signature,
 };
 use sp_api::{ApiError, ProvideRuntimeApi};
 use sp_authority_discovery::{
diff --git a/substrate/client/authority-discovery/src/worker/tests.rs b/substrate/client/authority-discovery/src/worker/tests.rs
index 22f984d9718eeb390bb923004965b03a01bd9a13..febe40657e06a5d490d45d2c6953cc6bcfb08302 100644
--- a/substrate/client/authority-discovery/src/worker/tests.rs
+++ b/substrate/client/authority-discovery/src/worker/tests.rs
@@ -29,11 +29,16 @@ use futures::{
 	sink::SinkExt,
 	task::LocalSpawn,
 };
-use libp2p::{core::multiaddr, identity::Keypair, PeerId};
+use libp2p::{
+	core::multiaddr,
+	identity::{error::SigningError, Keypair},
+	kad::record::Key as KademliaKey,
+	PeerId,
+};
 use prometheus_endpoint::prometheus::default_registry;
 
 use sc_client_api::HeaderBackend;
-use sc_network_common::service::{KademliaKey, Signature, SigningError};
+use sc_network::Signature;
 use sp_api::{ApiRef, ProvideRuntimeApi};
 use sp_keystore::{testing::KeyStore, CryptoStore};
 use sp_runtime::traits::{Block as BlockT, NumberFor, Zero};
diff --git a/substrate/client/chain-spec/Cargo.toml b/substrate/client/chain-spec/Cargo.toml
index 6168a897c962cb50cb958a4f61f2729b28162ed8..b1188b3bd4625fb6d57b8f92549eb858b9d2b62b 100644
--- a/substrate/client/chain-spec/Cargo.toml
+++ b/substrate/client/chain-spec/Cargo.toml
@@ -19,7 +19,7 @@ serde_json = "1.0.85"
 sc-client-api = { version = "4.0.0-dev", path = "../api" }
 sc-chain-spec-derive = { version = "4.0.0-dev", path = "./derive" }
 sc-executor = { version = "0.10.0-dev", path = "../executor" }
-sc-network-common = { version = "0.10.0-dev", path = "../network/common" }
+sc-network = { version = "0.10.0-dev", path = "../network" }
 sc-telemetry = { version = "4.0.0-dev", path = "../telemetry" }
 sp-blockchain = { version = "4.0.0-dev", path = "../../primitives/blockchain" }
 sp-core = { version = "7.0.0", path = "../../primitives/core" }
diff --git a/substrate/client/chain-spec/src/chain_spec.rs b/substrate/client/chain-spec/src/chain_spec.rs
index 9eed5bbbc4e69b87f9f503dd899c08185106e967..96e36d8399ed5de6328553200d181c0a661c422d 100644
--- a/substrate/client/chain-spec/src/chain_spec.rs
+++ b/substrate/client/chain-spec/src/chain_spec.rs
@@ -20,7 +20,7 @@
 #![warn(missing_docs)]
 
 use crate::{extension::GetExtension, ChainType, Properties, RuntimeGenesis};
-use sc_network_common::config::MultiaddrWithPeerId;
+use sc_network::config::MultiaddrWithPeerId;
 use sc_telemetry::TelemetryEndpoints;
 use serde::{Deserialize, Serialize};
 use serde_json as json;
diff --git a/substrate/client/chain-spec/src/lib.rs b/substrate/client/chain-spec/src/lib.rs
index e43a247961f02ba872980933527a8bd4bfcfd945..6239eb7326b789b42876666b8f325d260402956c 100644
--- a/substrate/client/chain-spec/src/lib.rs
+++ b/substrate/client/chain-spec/src/lib.rs
@@ -189,7 +189,7 @@ pub use self::{
 };
 pub use sc_chain_spec_derive::{ChainSpecExtension, ChainSpecGroup};
 
-use sc_network_common::config::MultiaddrWithPeerId;
+use sc_network::config::MultiaddrWithPeerId;
 use sc_telemetry::TelemetryEndpoints;
 use serde::{de::DeserializeOwned, Serialize};
 use sp_core::storage::Storage;
diff --git a/substrate/client/cli/src/arg_enums.rs b/substrate/client/cli/src/arg_enums.rs
index 472c1722f9ed805f417ae61e5baf89903a5753e3..c3399a89680d184304e3287f799e7e2076e32430 100644
--- a/substrate/client/cli/src/arg_enums.rs
+++ b/substrate/client/cli/src/arg_enums.rs
@@ -251,19 +251,15 @@ pub enum SyncMode {
 	Warp,
 }
 
-impl Into<sc_network_common::config::SyncMode> for SyncMode {
-	fn into(self) -> sc_network_common::config::SyncMode {
+impl Into<sc_network::config::SyncMode> for SyncMode {
+	fn into(self) -> sc_network::config::SyncMode {
 		match self {
-			SyncMode::Full => sc_network_common::config::SyncMode::Full,
-			SyncMode::Fast => sc_network_common::config::SyncMode::Fast {
-				skip_proofs: false,
-				storage_chain_mode: false,
-			},
-			SyncMode::FastUnsafe => sc_network_common::config::SyncMode::Fast {
-				skip_proofs: true,
-				storage_chain_mode: false,
-			},
-			SyncMode::Warp => sc_network_common::config::SyncMode::Warp,
+			SyncMode::Full => sc_network::config::SyncMode::Full,
+			SyncMode::Fast =>
+				sc_network::config::SyncMode::Fast { skip_proofs: false, storage_chain_mode: false },
+			SyncMode::FastUnsafe =>
+				sc_network::config::SyncMode::Fast { skip_proofs: true, storage_chain_mode: false },
+			SyncMode::Warp => sc_network::config::SyncMode::Warp,
 		}
 	}
 }
diff --git a/substrate/client/cli/src/params/network_params.rs b/substrate/client/cli/src/params/network_params.rs
index 31b761938df84cbb7c8cb925eaa27680351e512c..106fba75aa727d8dd494745116e0bdc34b6a50d8 100644
--- a/substrate/client/cli/src/params/network_params.rs
+++ b/substrate/client/cli/src/params/network_params.rs
@@ -18,8 +18,12 @@
 
 use crate::{arg_enums::SyncMode, params::node_key_params::NodeKeyParams};
 use clap::Args;
-use sc_network::{config::NetworkConfiguration, multiaddr::Protocol};
-use sc_network_common::config::{NodeKeyConfig, NonReservedPeerMode, SetConfig, TransportConfig};
+use sc_network::{
+	config::{
+		NetworkConfiguration, NodeKeyConfig, NonReservedPeerMode, SetConfig, TransportConfig,
+	},
+	multiaddr::Protocol,
+};
 use sc_service::{
 	config::{Multiaddr, MultiaddrWithPeerId},
 	ChainSpec, ChainType,
diff --git a/substrate/client/cli/src/params/node_key_params.rs b/substrate/client/cli/src/params/node_key_params.rs
index d470ef1fad12a7d708799aa1c23171aa5e84ebd6..074b95bea0f3a5e895e0b501ff8c54010a6c5383 100644
--- a/substrate/client/cli/src/params/node_key_params.rs
+++ b/substrate/client/cli/src/params/node_key_params.rs
@@ -17,7 +17,7 @@
 // along with this program. If not, see <https://www.gnu.org/licenses/>.
 
 use clap::Args;
-use sc_network_common::config::{identity::ed25519, NodeKeyConfig};
+use sc_network::config::{identity::ed25519, NodeKeyConfig};
 use sp_core::H256;
 use std::{path::PathBuf, str::FromStr};
 
@@ -92,7 +92,7 @@ impl NodeKeyParams {
 				let secret = if let Some(node_key) = self.node_key.as_ref() {
 					parse_ed25519_secret(node_key)?
 				} else {
-					sc_network_common::config::Secret::File(
+					sc_network::config::Secret::File(
 						self.node_key_file
 							.clone()
 							.unwrap_or_else(|| net_config_dir.join(NODE_KEY_ED25519_FILE)),
@@ -111,10 +111,10 @@ fn invalid_node_key(e: impl std::fmt::Display) -> error::Error {
 }
 
 /// Parse a Ed25519 secret key from a hex string into a `sc_network::Secret`.
-fn parse_ed25519_secret(hex: &str) -> error::Result<sc_network_common::config::Ed25519Secret> {
+fn parse_ed25519_secret(hex: &str) -> error::Result<sc_network::config::Ed25519Secret> {
 	H256::from_str(hex).map_err(invalid_node_key).and_then(|bytes| {
 		ed25519::SecretKey::from_bytes(bytes)
-			.map(sc_network_common::config::Secret::Input)
+			.map(sc_network::config::Secret::Input)
 			.map_err(invalid_node_key)
 	})
 }
@@ -123,7 +123,7 @@ fn parse_ed25519_secret(hex: &str) -> error::Result<sc_network_common::config::E
 mod tests {
 	use super::*;
 	use clap::ValueEnum;
-	use sc_network_common::config::identity::{ed25519, Keypair};
+	use sc_network::config::identity::{ed25519, Keypair};
 	use std::fs;
 
 	#[test]
@@ -140,7 +140,7 @@ mod tests {
 					node_key_file: None,
 				};
 				params.node_key(net_config_dir).and_then(|c| match c {
-					NodeKeyConfig::Ed25519(sc_network_common::config::Secret::Input(ref ski))
+					NodeKeyConfig::Ed25519(sc_network::config::Secret::Input(ref ski))
 						if node_key_type == NodeKeyType::Ed25519 && &sk[..] == ski.as_ref() =>
 						Ok(()),
 					_ => Err(error::Error::Input("Unexpected node key config".into())),
@@ -200,7 +200,7 @@ mod tests {
 				let dir = PathBuf::from(net_config_dir.clone());
 				let typ = params.node_key_type;
 				params.node_key(net_config_dir).and_then(move |c| match c {
-					NodeKeyConfig::Ed25519(sc_network_common::config::Secret::File(ref f))
+					NodeKeyConfig::Ed25519(sc_network::config::Secret::File(ref f))
 						if typ == NodeKeyType::Ed25519 && f == &dir.join(NODE_KEY_ED25519_FILE) =>
 						Ok(()),
 					_ => Err(error::Error::Input("Unexpected node key config".into())),
diff --git a/substrate/client/consensus/beefy/src/communication/mod.rs b/substrate/client/consensus/beefy/src/communication/mod.rs
index f91b08bbc97ec7603062a44169a1b8ac80abb64c..295d549bb1ba82c1bd832d0eda2183aa00ee0ed8 100644
--- a/substrate/client/consensus/beefy/src/communication/mod.rs
+++ b/substrate/client/consensus/beefy/src/communication/mod.rs
@@ -67,9 +67,8 @@ pub(crate) mod beefy_protocol_name {
 /// For standard protocol name see [`beefy_protocol_name::gossip_protocol_name`].
 pub fn beefy_peers_set_config(
 	gossip_protocol_name: sc_network::ProtocolName,
-) -> sc_network_common::config::NonDefaultSetConfig {
-	let mut cfg =
-		sc_network_common::config::NonDefaultSetConfig::new(gossip_protocol_name, 1024 * 1024);
+) -> sc_network::config::NonDefaultSetConfig {
+	let mut cfg = sc_network::config::NonDefaultSetConfig::new(gossip_protocol_name, 1024 * 1024);
 	cfg.allow_non_reserved(25, 25);
 	cfg
 }
diff --git a/substrate/client/consensus/beefy/src/communication/request_response/incoming_requests_handler.rs b/substrate/client/consensus/beefy/src/communication/request_response/incoming_requests_handler.rs
index ab6c21a187c9563b795f592f6046bd71784c1174..1670e99828831c2d999584c5ec5dcbf3e5a5a183 100644
--- a/substrate/client/consensus/beefy/src/communication/request_response/incoming_requests_handler.rs
+++ b/substrate/client/consensus/beefy/src/communication/request_response/incoming_requests_handler.rs
@@ -23,8 +23,10 @@ use futures::{
 };
 use log::{debug, trace};
 use sc_client_api::BlockBackend;
-use sc_network::{config as netconfig, config::RequestResponseConfig, PeerId, ReputationChange};
-use sc_network_common::protocol::ProtocolName;
+use sc_network::{
+	config as netconfig, config::RequestResponseConfig, types::ProtocolName, PeerId,
+	ReputationChange,
+};
 use sp_consensus_beefy::BEEFY_ENGINE_ID;
 use sp_runtime::traits::Block;
 use std::{marker::PhantomData, sync::Arc};
diff --git a/substrate/client/consensus/beefy/src/communication/request_response/outgoing_requests_engine.rs b/substrate/client/consensus/beefy/src/communication/request_response/outgoing_requests_engine.rs
index 7450d4b3239f138c5d7502503f4f808f0d2f014f..c642e3dfe581ce9d45ae117409fc39ddf546175a 100644
--- a/substrate/client/consensus/beefy/src/communication/request_response/outgoing_requests_engine.rs
+++ b/substrate/client/consensus/beefy/src/communication/request_response/outgoing_requests_engine.rs
@@ -22,10 +22,9 @@ use codec::Encode;
 use futures::channel::{oneshot, oneshot::Canceled};
 use log::{debug, warn};
 use parking_lot::Mutex;
-use sc_network::{PeerId, ProtocolName};
-use sc_network_common::{
+use sc_network::{
 	request_responses::{IfDisconnected, RequestFailure},
-	service::NetworkRequest,
+	NetworkRequest, PeerId, ProtocolName,
 };
 use sp_consensus_beefy::{crypto::AuthorityId, ValidatorSet};
 use sp_runtime::traits::{Block, NumberFor};
diff --git a/substrate/client/consensus/beefy/src/lib.rs b/substrate/client/consensus/beefy/src/lib.rs
index 67758a4979b19314c8f5d014fb49d5ac24b4293b..eb56a97de1dd9ec0cef5b02f8f0e518af872856f 100644
--- a/substrate/client/consensus/beefy/src/lib.rs
+++ b/substrate/client/consensus/beefy/src/lib.rs
@@ -38,8 +38,7 @@ use parking_lot::Mutex;
 use prometheus::Registry;
 use sc_client_api::{Backend, BlockBackend, BlockchainEvents, FinalityNotifications, Finalizer};
 use sc_consensus::BlockImport;
-use sc_network::ProtocolName;
-use sc_network_common::service::NetworkRequest;
+use sc_network::{NetworkRequest, ProtocolName};
 use sc_network_gossip::{GossipEngine, Network as GossipNetwork, Syncing as GossipSyncing};
 use sp_api::{HeaderT, NumberFor, ProvideRuntimeApi};
 use sp_blockchain::{
diff --git a/substrate/client/consensus/grandpa/src/communication/gossip.rs b/substrate/client/consensus/grandpa/src/communication/gossip.rs
index 0a3029e25477a2f912096290efa3aabba2977f96..2c0fe3d8571e52e47eeda4ad26de9902a6ce02e4 100644
--- a/substrate/client/consensus/grandpa/src/communication/gossip.rs
+++ b/substrate/client/consensus/grandpa/src/communication/gossip.rs
@@ -91,7 +91,7 @@ use parity_scale_codec::{Decode, Encode};
 use prometheus_endpoint::{register, CounterVec, Opts, PrometheusError, Registry, U64};
 use rand::seq::SliceRandom;
 use sc_network::{PeerId, ReputationChange};
-use sc_network_common::protocol::role::ObservedRole;
+use sc_network_common::role::ObservedRole;
 use sc_network_gossip::{MessageIntent, ValidatorContext};
 use sc_telemetry::{telemetry, TelemetryHandle, CONSENSUS_DEBUG};
 use sc_utils::mpsc::{tracing_unbounded, TracingUnboundedReceiver, TracingUnboundedSender};
@@ -820,7 +820,7 @@ impl<Block: BlockT> Inner<Block> {
 	fn note_set(&mut self, set_id: SetId, authorities: Vec<AuthorityId>) -> MaybeMessage<Block> {
 		let local_view = match self.local_view {
 			ref mut x @ None => x.get_or_insert(LocalView::new(set_id, Round(1))),
-			Some(ref mut v) =>
+			Some(ref mut v) => {
 				if v.set_id == set_id {
 					let diff_authorities = self.authorities.iter().collect::<HashSet<_>>() !=
 						authorities.iter().collect::<HashSet<_>>();
@@ -841,7 +841,8 @@ impl<Block: BlockT> Inner<Block> {
 					return None
 				} else {
 					v
-				},
+				}
+			},
 		};
 
 		local_view.update_set(set_id);
diff --git a/substrate/client/consensus/grandpa/src/communication/mod.rs b/substrate/client/consensus/grandpa/src/communication/mod.rs
index 6c7e3ea46511ea8ce992c3dbddecedf2d2397cd0..3896bc36031baf503fd5da2c74675e9a34025375 100644
--- a/substrate/client/consensus/grandpa/src/communication/mod.rs
+++ b/substrate/client/consensus/grandpa/src/communication/mod.rs
@@ -46,7 +46,7 @@ use finality_grandpa::{
 	Message::{Precommit, Prevote, PrimaryPropose},
 };
 use parity_scale_codec::{Decode, Encode};
-use sc_network::ReputationChange;
+use sc_network::{NetworkBlock, NetworkSyncForkRequest, ReputationChange};
 use sc_network_gossip::{GossipEngine, Network as GossipNetwork};
 use sc_telemetry::{telemetry, TelemetryHandle, CONSENSUS_DEBUG, CONSENSUS_INFO};
 use sp_keystore::SyncCryptoStorePtr;
@@ -59,10 +59,7 @@ use crate::{
 use gossip::{
 	FullCatchUpMessage, FullCommitMessage, GossipMessage, GossipValidator, PeerReport, VoteMessage,
 };
-use sc_network_common::{
-	service::{NetworkBlock, NetworkSyncForkRequest},
-	sync::SyncEventStream,
-};
+use sc_network_common::sync::SyncEventStream;
 use sc_utils::mpsc::TracingUnboundedReceiver;
 use sp_consensus_grandpa::{AuthorityId, AuthoritySignature, RoundNumber, SetId as SetIdNumber};
 
@@ -77,7 +74,7 @@ pub(crate) const NEIGHBOR_REBROADCAST_PERIOD: Duration = Duration::from_secs(2 *
 
 pub mod grandpa_protocol_name {
 	use sc_chain_spec::ChainSpec;
-	use sc_network_common::protocol::ProtocolName;
+	use sc_network::types::ProtocolName;
 
 	pub(crate) const NAME: &str = "/grandpa/1";
 	/// Old names for the notifications protocol, used for backward compatibility.
diff --git a/substrate/client/consensus/grandpa/src/communication/tests.rs b/substrate/client/consensus/grandpa/src/communication/tests.rs
index 843e5467910e85105949cbd79592f91c3fc95edb..f97b1f1e8818103c8f2c72a11ea1351fe413566e 100644
--- a/substrate/client/consensus/grandpa/src/communication/tests.rs
+++ b/substrate/client/consensus/grandpa/src/communication/tests.rs
@@ -25,14 +25,16 @@ use super::{
 use crate::{communication::grandpa_protocol_name, environment::SharedVoterSetState};
 use futures::prelude::*;
 use parity_scale_codec::Encode;
-use sc_network::{config::Role, Multiaddr, PeerId, ReputationChange};
+use sc_network::{
+	config::{MultiaddrWithPeerId, Role},
+	event::Event as NetworkEvent,
+	types::ProtocolName,
+	Multiaddr, NetworkBlock, NetworkEventStream, NetworkNotification, NetworkPeers,
+	NetworkSyncForkRequest, NotificationSenderError, NotificationSenderT as NotificationSender,
+	PeerId, ReputationChange,
+};
 use sc_network_common::{
-	config::MultiaddrWithPeerId,
-	protocol::{event::Event as NetworkEvent, role::ObservedRole, ProtocolName},
-	service::{
-		NetworkBlock, NetworkEventStream, NetworkNotification, NetworkPeers,
-		NetworkSyncForkRequest, NotificationSender, NotificationSenderError,
-	},
+	role::ObservedRole,
 	sync::{SyncEvent as SyncStreamEvent, SyncEventStream},
 };
 use sc_network_gossip::Validator;
diff --git a/substrate/client/consensus/grandpa/src/lib.rs b/substrate/client/consensus/grandpa/src/lib.rs
index 7bf48a498fabbb4b24ad028fd9301554334b73bb..2baa135081c55fc87ac36cf9b028f3e024693457 100644
--- a/substrate/client/consensus/grandpa/src/lib.rs
+++ b/substrate/client/consensus/grandpa/src/lib.rs
@@ -68,7 +68,7 @@ use sc_client_api::{
 	StorageProvider, TransactionFor,
 };
 use sc_consensus::BlockImport;
-use sc_network_common::protocol::ProtocolName;
+use sc_network::types::ProtocolName;
 use sc_telemetry::{telemetry, TelemetryHandle, CONSENSUS_DEBUG, CONSENSUS_INFO};
 use sc_utils::mpsc::{tracing_unbounded, TracingUnboundedReceiver};
 use sp_api::ProvideRuntimeApi;
@@ -695,19 +695,19 @@ pub struct GrandpaParams<Block: BlockT, C, N, S, SC, VR> {
 /// For standard protocol name see [`crate::protocol_standard_name`].
 pub fn grandpa_peers_set_config(
 	protocol_name: ProtocolName,
-) -> sc_network_common::config::NonDefaultSetConfig {
+) -> sc_network::config::NonDefaultSetConfig {
 	use communication::grandpa_protocol_name;
-	sc_network_common::config::NonDefaultSetConfig {
+	sc_network::config::NonDefaultSetConfig {
 		notifications_protocol: protocol_name,
 		fallback_names: grandpa_protocol_name::LEGACY_NAMES.iter().map(|&n| n.into()).collect(),
 		// Notifications reach ~256kiB in size at the time of writing on Kusama and Polkadot.
 		max_notification_size: 1024 * 1024,
 		handshake: None,
-		set_config: sc_network_common::config::SetConfig {
+		set_config: sc_network::config::SetConfig {
 			in_peers: 0,
 			out_peers: 0,
 			reserved_nodes: Vec::new(),
-			non_reserved_mode: sc_network_common::config::NonReservedPeerMode::Deny,
+			non_reserved_mode: sc_network::config::NonReservedPeerMode::Deny,
 		},
 	}
 }
diff --git a/substrate/client/informant/Cargo.toml b/substrate/client/informant/Cargo.toml
index ca0ae03af32651be94f0948d579d0a2e39d83a50..cd84dcb5a0dfe4476968c3b104288d00ce46406f 100644
--- a/substrate/client/informant/Cargo.toml
+++ b/substrate/client/informant/Cargo.toml
@@ -19,5 +19,6 @@ futures-timer = "3.0.1"
 log = "0.4.17"
 sc-client-api = { version = "4.0.0-dev", path = "../api" }
 sc-network-common = { version = "0.10.0-dev", path = "../network/common" }
+sc-network = { version = "0.10.0-dev", path = "../network" }
 sp-blockchain = { version = "4.0.0-dev", path = "../../primitives/blockchain" }
 sp-runtime = { version = "7.0.0", path = "../../primitives/runtime" }
diff --git a/substrate/client/informant/src/display.rs b/substrate/client/informant/src/display.rs
index fc68e5603c134646f87c97c94181a02e02818aa6..46e7229273d794181404da52570a073b2814a693 100644
--- a/substrate/client/informant/src/display.rs
+++ b/substrate/client/informant/src/display.rs
@@ -20,12 +20,10 @@ use crate::OutputFormat;
 use ansi_term::Colour;
 use log::info;
 use sc_client_api::ClientInfo;
-use sc_network_common::{
-	service::NetworkStatus,
-	sync::{
-		warp::{WarpSyncPhase, WarpSyncProgress},
-		SyncState, SyncStatus,
-	},
+use sc_network::NetworkStatus;
+use sc_network_common::sync::{
+	warp::{WarpSyncPhase, WarpSyncProgress},
+	SyncState, SyncStatus,
 };
 use sp_runtime::traits::{Block as BlockT, CheckedDiv, NumberFor, Saturating, Zero};
 use std::{fmt, time::Instant};
diff --git a/substrate/client/informant/src/lib.rs b/substrate/client/informant/src/lib.rs
index dc6aebc2ed658a6f7d2d653822e710c0def630eb..03f9075055e2ff98346d84fe6f6c362c468f45b6 100644
--- a/substrate/client/informant/src/lib.rs
+++ b/substrate/client/informant/src/lib.rs
@@ -23,7 +23,8 @@ use futures::prelude::*;
 use futures_timer::Delay;
 use log::{debug, info, trace};
 use sc_client_api::{BlockchainEvents, UsageProvider};
-use sc_network_common::{service::NetworkStatusProvider, sync::SyncStatusProvider};
+use sc_network::NetworkStatusProvider;
+use sc_network_common::sync::SyncStatusProvider;
 use sp_blockchain::HeaderMetadata;
 use sp_runtime::traits::{Block as BlockT, Header};
 use std::{collections::VecDeque, fmt::Display, sync::Arc, time::Duration};
diff --git a/substrate/client/network-gossip/Cargo.toml b/substrate/client/network-gossip/Cargo.toml
index 7811e86c095ba6ec04144e64a81374ff3b3f10b3..5c1bc91f105c8e0c253633bed5092804d97d612c 100644
--- a/substrate/client/network-gossip/Cargo.toml
+++ b/substrate/client/network-gossip/Cargo.toml
@@ -22,6 +22,7 @@ log = "0.4.17"
 lru = "0.8.1"
 tracing = "0.1.29"
 prometheus-endpoint = { package = "substrate-prometheus-endpoint", version = "0.10.0-dev", path = "../../utils/prometheus" }
+sc-network = { version = "0.10.0-dev", path = "../network/" }
 sc-network-common = { version = "0.10.0-dev", path = "../network/common" }
 sc-peerset = { version = "4.0.0-dev", path = "../peerset" }
 sp-runtime = { version = "7.0.0", path = "../../primitives/runtime" }
diff --git a/substrate/client/network-gossip/src/bridge.rs b/substrate/client/network-gossip/src/bridge.rs
index 7368cc770306e589f8619038e69c0feb8d32dee2..4793d7822ddbed625ce114ad1da44f6da99d1319 100644
--- a/substrate/client/network-gossip/src/bridge.rs
+++ b/substrate/client/network-gossip/src/bridge.rs
@@ -21,10 +21,8 @@ use crate::{
 	Network, Syncing, Validator,
 };
 
-use sc_network_common::{
-	protocol::{event::Event, ProtocolName},
-	sync::SyncEvent,
-};
+use sc_network::{event::Event, types::ProtocolName};
+use sc_network_common::sync::SyncEvent;
 use sc_peerset::ReputationChange;
 
 use futures::{
@@ -340,15 +338,11 @@ mod tests {
 		future::poll_fn,
 	};
 	use quickcheck::{Arbitrary, Gen, QuickCheck};
-	use sc_network_common::{
-		config::MultiaddrWithPeerId,
-		protocol::role::ObservedRole,
-		service::{
-			NetworkBlock, NetworkEventStream, NetworkNotification, NetworkPeers,
-			NotificationSender, NotificationSenderError,
-		},
-		sync::SyncEventStream,
+	use sc_network::{
+		config::MultiaddrWithPeerId, NetworkBlock, NetworkEventStream, NetworkNotification,
+		NetworkPeers, NotificationSenderError, NotificationSenderT as NotificationSender,
 	};
+	use sc_network_common::{role::ObservedRole, sync::SyncEventStream};
 	use sp_runtime::{
 		testing::H256,
 		traits::{Block as BlockT, NumberFor},
diff --git a/substrate/client/network-gossip/src/lib.rs b/substrate/client/network-gossip/src/lib.rs
index e3448ba01c3737c6b21bb1e62a9806a0c0c6c307..ef87dd599e0104e31574e1a166431c21827ff6dc 100644
--- a/substrate/client/network-gossip/src/lib.rs
+++ b/substrate/client/network-gossip/src/lib.rs
@@ -68,11 +68,10 @@ pub use self::{
 };
 
 use libp2p::{multiaddr, PeerId};
-use sc_network_common::{
-	protocol::ProtocolName,
-	service::{NetworkBlock, NetworkEventStream, NetworkNotification, NetworkPeers},
-	sync::SyncEventStream,
+use sc_network::{
+	types::ProtocolName, NetworkBlock, NetworkEventStream, NetworkNotification, NetworkPeers,
 };
+use sc_network_common::sync::SyncEventStream;
 use sp_runtime::traits::{Block as BlockT, NumberFor};
 use std::iter;
 
diff --git a/substrate/client/network-gossip/src/state_machine.rs b/substrate/client/network-gossip/src/state_machine.rs
index 3a0d5fc0de173eb5f613f3c97edd9514f988003e..e6d2b0e2ae4c873d79c3f3ef03e0fd5c4c2f3bd6 100644
--- a/substrate/client/network-gossip/src/state_machine.rs
+++ b/substrate/client/network-gossip/src/state_machine.rs
@@ -22,7 +22,8 @@ use ahash::AHashSet;
 use libp2p::PeerId;
 use lru::LruCache;
 use prometheus_endpoint::{register, Counter, PrometheusError, Registry, U64};
-use sc_network_common::protocol::{role::ObservedRole, ProtocolName};
+use sc_network::types::ProtocolName;
+use sc_network_common::role::ObservedRole;
 use sp_runtime::traits::{Block as BlockT, Hash, HashFor};
 use std::{collections::HashMap, iter, num::NonZeroUsize, sync::Arc, time, time::Instant};
 
@@ -525,13 +526,10 @@ mod tests {
 	use super::*;
 	use crate::multiaddr::Multiaddr;
 	use futures::prelude::*;
-	use sc_network_common::{
-		config::MultiaddrWithPeerId,
-		protocol::event::Event,
-		service::{
-			NetworkBlock, NetworkEventStream, NetworkNotification, NetworkPeers,
-			NotificationSender, NotificationSenderError,
-		},
+	use sc_network::{
+		config::MultiaddrWithPeerId, event::Event, NetworkBlock, NetworkEventStream,
+		NetworkNotification, NetworkPeers, NotificationSenderError,
+		NotificationSenderT as NotificationSender,
 	};
 	use sc_peerset::ReputationChange;
 	use sp_runtime::{
diff --git a/substrate/client/network-gossip/src/validator.rs b/substrate/client/network-gossip/src/validator.rs
index 26835a5ae6687fcef2ab9f268dafb82b0ed9f0dc..2272efba50652492178fe7cfa2c0bcbd731e9138 100644
--- a/substrate/client/network-gossip/src/validator.rs
+++ b/substrate/client/network-gossip/src/validator.rs
@@ -17,7 +17,7 @@
 // along with this program. If not, see <https://www.gnu.org/licenses/>.
 
 use libp2p::PeerId;
-use sc_network_common::protocol::role::ObservedRole;
+use sc_network_common::role::ObservedRole;
 use sp_runtime::traits::Block as BlockT;
 
 /// Validates consensus messages.
diff --git a/substrate/client/network/Cargo.toml b/substrate/client/network/Cargo.toml
index 5a918bebd626ee928f8479327d7454a761b181bf..90b5ce871ef1a6d0d80edc044050db55c7b1bf8d 100644
--- a/substrate/client/network/Cargo.toml
+++ b/substrate/client/network/Cargo.toml
@@ -26,6 +26,7 @@ futures = "0.3.21"
 futures-timer = "3.0.2"
 ip_network = "0.4.1"
 libp2p = { version = "0.50.0", features = ["dns", "identify", "kad", "macros", "mdns", "mplex", "noise", "ping", "tcp",  "tokio", "yamux", "websocket"] }
+linked_hash_set = "0.1.3"
 log = "0.4.17"
 lru = "0.8.1"
 mockall = "0.11.3"
diff --git a/substrate/client/network/bitswap/Cargo.toml b/substrate/client/network/bitswap/Cargo.toml
index 0bbb5ff09e4b9d705d1dc34247bef294a1faf17e..ee2e0cfc79ff79540e9cb376a57abcf2a935fa6e 100644
--- a/substrate/client/network/bitswap/Cargo.toml
+++ b/substrate/client/network/bitswap/Cargo.toml
@@ -24,6 +24,7 @@ prost = "0.11"
 thiserror = "1.0"
 unsigned-varint = { version = "0.7.1", features = ["futures", "asynchronous_codec"] }
 sc-client-api = { version = "4.0.0-dev", path = "../../api" }
+sc-network = { version = "0.10.0-dev", path = "../" }
 sc-network-common = { version = "0.10.0-dev", path = "../common" }
 sp-blockchain = { version = "4.0.0-dev", path = "../../../primitives/blockchain" }
 sp-runtime = { version = "7.0.0", path = "../../../primitives/runtime" }
diff --git a/substrate/client/network/bitswap/src/lib.rs b/substrate/client/network/bitswap/src/lib.rs
index dd5fc46f6ca71425ad1643c173027863b5ddb9e6..5a7a7b51355c6c66ce1d61ca7e755169dd5798d7 100644
--- a/substrate/client/network/bitswap/src/lib.rs
+++ b/substrate/client/network/bitswap/src/lib.rs
@@ -26,9 +26,9 @@ use libp2p::core::PeerId;
 use log::{debug, error, trace};
 use prost::Message;
 use sc_client_api::BlockBackend;
-use sc_network_common::{
-	protocol::ProtocolName,
+use sc_network::{
 	request_responses::{IncomingRequest, OutgoingResponse, ProtocolConfig},
+	types::ProtocolName,
 };
 use schema::bitswap::{
 	message::{wantlist::WantType, Block as MessageBlock, BlockPresence, BlockPresenceType},
@@ -127,8 +127,9 @@ impl<B: BlockT> BitswapRequestHandler<B> {
 					};
 
 					match pending_response.send(response) {
-						Ok(()) =>
-							trace!(target: LOG_TARGET, "Handled bitswap request from {peer}.",),
+						Ok(()) => {
+							trace!(target: LOG_TARGET, "Handled bitswap request from {peer}.",)
+						},
 						Err(_) => debug!(
 							target: LOG_TARGET,
 							"Failed to handle light client request from {peer}: {}",
diff --git a/substrate/client/network/common/Cargo.toml b/substrate/client/network/common/Cargo.toml
index c5f9d6d4cb027a1d4e0832f33bed5ee2ce68981d..983342b014b82d54fdddfe32d8af8069e7a48bd9 100644
--- a/substrate/client/network/common/Cargo.toml
+++ b/substrate/client/network/common/Cargo.toml
@@ -26,7 +26,6 @@ codec = { package = "parity-scale-codec", version = "3.2.2", features = [
 futures = "0.3.21"
 futures-timer = "3.0.2"
 libp2p = { version = "0.50.0", features = ["request-response", "kad"] }
-linked_hash_set = "0.1.3"
 prometheus-endpoint = { package = "substrate-prometheus-endpoint", version = "0.10.0-dev", path = "../../../utils/prometheus" }
 smallvec = "1.8.0"
 sc-consensus = { version = "0.10.0-dev", path = "../../consensus/common" }
diff --git a/substrate/client/network/common/src/config.rs b/substrate/client/network/common/src/config.rs
deleted file mode 100644
index 6a02129fcfe067f3ff33e558a787348c751a4f2e..0000000000000000000000000000000000000000
--- a/substrate/client/network/common/src/config.rs
+++ /dev/null
@@ -1,702 +0,0 @@
-// This file is part of Substrate.
-
-// Copyright (C) Parity Technologies (UK) Ltd.
-// SPDX-License-Identifier: GPL-3.0-or-later WITH Classpath-exception-2.0
-
-// This program is free software: you can redistribute it and/or modify
-// it under the terms of the GNU General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-
-// This program is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-// GNU General Public License for more details.
-
-// You should have received a copy of the GNU General Public License
-// along with this program. If not, see <https://www.gnu.org/licenses/>.
-
-//! Configuration of the networking layer.
-
-pub use crate::{
-	protocol::{self, role::Role},
-	request_responses::{
-		IncomingRequest, OutgoingResponse, ProtocolConfig as RequestResponseConfig,
-	},
-	sync::warp::WarpSyncProvider,
-	ExHashT,
-};
-pub use libp2p::{build_multiaddr, core::PublicKey, identity};
-
-use codec::Encode;
-use libp2p::{
-	identity::{ed25519, Keypair},
-	multiaddr, Multiaddr, PeerId,
-};
-use zeroize::Zeroize;
-
-use std::{
-	error::Error,
-	fmt, fs,
-	io::{self, Write},
-	iter,
-	net::Ipv4Addr,
-	path::{Path, PathBuf},
-	str,
-	str::FromStr,
-};
-
-/// Protocol name prefix, transmitted on the wire for legacy protocol names.
-/// I.e., `dot` in `/dot/sync/2`. Should be unique for each chain. Always UTF-8.
-/// Deprecated in favour of genesis hash & fork ID based protocol names.
-#[derive(Clone, PartialEq, Eq, Hash)]
-pub struct ProtocolId(smallvec::SmallVec<[u8; 6]>);
-
-impl<'a> From<&'a str> for ProtocolId {
-	fn from(bytes: &'a str) -> ProtocolId {
-		Self(bytes.as_bytes().into())
-	}
-}
-
-impl AsRef<str> for ProtocolId {
-	fn as_ref(&self) -> &str {
-		str::from_utf8(&self.0[..])
-			.expect("the only way to build a ProtocolId is through a UTF-8 String; qed")
-	}
-}
-
-impl fmt::Debug for ProtocolId {
-	fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-		fmt::Debug::fmt(self.as_ref(), f)
-	}
-}
-
-/// Parses a string address and splits it into Multiaddress and PeerId, if
-/// valid.
-///
-/// # Example
-///
-/// ```
-/// # use libp2p::{Multiaddr, PeerId};
-/// # use sc_network_common::config::parse_str_addr;
-/// let (peer_id, addr) = parse_str_addr(
-/// 	"/ip4/198.51.100.19/tcp/30333/p2p/QmSk5HQbn6LhUwDiNMseVUjuRYhEtYj4aUZ6WfWoGURpdV"
-/// ).unwrap();
-/// assert_eq!(peer_id, "QmSk5HQbn6LhUwDiNMseVUjuRYhEtYj4aUZ6WfWoGURpdV".parse::<PeerId>().unwrap());
-/// assert_eq!(addr, "/ip4/198.51.100.19/tcp/30333".parse::<Multiaddr>().unwrap());
-/// ```
-pub fn parse_str_addr(addr_str: &str) -> Result<(PeerId, Multiaddr), ParseErr> {
-	let addr: Multiaddr = addr_str.parse()?;
-	parse_addr(addr)
-}
-
-/// Splits a Multiaddress into a Multiaddress and PeerId.
-pub fn parse_addr(mut addr: Multiaddr) -> Result<(PeerId, Multiaddr), ParseErr> {
-	let who = match addr.pop() {
-		Some(multiaddr::Protocol::P2p(key)) =>
-			PeerId::from_multihash(key).map_err(|_| ParseErr::InvalidPeerId)?,
-		_ => return Err(ParseErr::PeerIdMissing),
-	};
-
-	Ok((who, addr))
-}
-
-/// Address of a node, including its identity.
-///
-/// This struct represents a decoded version of a multiaddress that ends with `/p2p/<peerid>`.
-///
-/// # Example
-///
-/// ```
-/// # use libp2p::{Multiaddr, PeerId};
-/// # use sc_network_common::config::MultiaddrWithPeerId;
-/// let addr: MultiaddrWithPeerId =
-/// 	"/ip4/198.51.100.19/tcp/30333/p2p/QmSk5HQbn6LhUwDiNMseVUjuRYhEtYj4aUZ6WfWoGURpdV".parse().unwrap();
-/// assert_eq!(addr.peer_id.to_base58(), "QmSk5HQbn6LhUwDiNMseVUjuRYhEtYj4aUZ6WfWoGURpdV");
-/// assert_eq!(addr.multiaddr.to_string(), "/ip4/198.51.100.19/tcp/30333");
-/// ```
-#[derive(Debug, Clone, serde::Serialize, serde::Deserialize, PartialEq)]
-#[serde(try_from = "String", into = "String")]
-pub struct MultiaddrWithPeerId {
-	/// Address of the node.
-	pub multiaddr: Multiaddr,
-	/// Its identity.
-	pub peer_id: PeerId,
-}
-
-impl MultiaddrWithPeerId {
-	/// Concatenates the multiaddress and peer ID into one multiaddress containing both.
-	pub fn concat(&self) -> Multiaddr {
-		let proto = multiaddr::Protocol::P2p(From::from(self.peer_id));
-		self.multiaddr.clone().with(proto)
-	}
-}
-
-impl fmt::Display for MultiaddrWithPeerId {
-	fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-		fmt::Display::fmt(&self.concat(), f)
-	}
-}
-
-impl FromStr for MultiaddrWithPeerId {
-	type Err = ParseErr;
-
-	fn from_str(s: &str) -> Result<Self, Self::Err> {
-		let (peer_id, multiaddr) = parse_str_addr(s)?;
-		Ok(Self { peer_id, multiaddr })
-	}
-}
-
-impl From<MultiaddrWithPeerId> for String {
-	fn from(ma: MultiaddrWithPeerId) -> String {
-		format!("{}", ma)
-	}
-}
-
-impl TryFrom<String> for MultiaddrWithPeerId {
-	type Error = ParseErr;
-	fn try_from(string: String) -> Result<Self, Self::Error> {
-		string.parse()
-	}
-}
-
-/// Error that can be generated by `parse_str_addr`.
-#[derive(Debug)]
-pub enum ParseErr {
-	/// Error while parsing the multiaddress.
-	MultiaddrParse(multiaddr::Error),
-	/// Multihash of the peer ID is invalid.
-	InvalidPeerId,
-	/// The peer ID is missing from the address.
-	PeerIdMissing,
-}
-
-impl fmt::Display for ParseErr {
-	fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-		match self {
-			Self::MultiaddrParse(err) => write!(f, "{}", err),
-			Self::InvalidPeerId => write!(f, "Peer id at the end of the address is invalid"),
-			Self::PeerIdMissing => write!(f, "Peer id is missing from the address"),
-		}
-	}
-}
-
-impl std::error::Error for ParseErr {
-	fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
-		match self {
-			Self::MultiaddrParse(err) => Some(err),
-			Self::InvalidPeerId => None,
-			Self::PeerIdMissing => None,
-		}
-	}
-}
-
-impl From<multiaddr::Error> for ParseErr {
-	fn from(err: multiaddr::Error) -> ParseErr {
-		Self::MultiaddrParse(err)
-	}
-}
-
-/// Configuration for a set of nodes.
-#[derive(Clone, Debug)]
-pub struct SetConfig {
-	/// Maximum allowed number of incoming substreams related to this set.
-	pub in_peers: u32,
-	/// Number of outgoing substreams related to this set that we're trying to maintain.
-	pub out_peers: u32,
-	/// List of reserved node addresses.
-	pub reserved_nodes: Vec<MultiaddrWithPeerId>,
-	/// Whether nodes that aren't in [`SetConfig::reserved_nodes`] are accepted or automatically
-	/// refused.
-	pub non_reserved_mode: NonReservedPeerMode,
-}
-
-impl Default for SetConfig {
-	fn default() -> Self {
-		Self {
-			in_peers: 25,
-			out_peers: 75,
-			reserved_nodes: Vec::new(),
-			non_reserved_mode: NonReservedPeerMode::Accept,
-		}
-	}
-}
-
-/// Custom handshake for the notification protocol
-#[derive(Debug, Clone)]
-pub struct NotificationHandshake(Vec<u8>);
-
-impl NotificationHandshake {
-	/// Create new `NotificationHandshake` from an object that implements `Encode`
-	pub fn new<H: Encode>(handshake: H) -> Self {
-		Self(handshake.encode())
-	}
-
-	/// Create new `NotificationHandshake` from raw bytes
-	pub fn from_bytes(bytes: Vec<u8>) -> Self {
-		Self(bytes)
-	}
-}
-
-impl std::ops::Deref for NotificationHandshake {
-	type Target = Vec<u8>;
-
-	fn deref(&self) -> &Self::Target {
-		&self.0
-	}
-}
-
-/// Extension to [`SetConfig`] for sets that aren't the default set.
-///
-/// > **Note**: As new fields might be added in the future, please consider using the `new` method
-/// >			and modifiers instead of creating this struct manually.
-#[derive(Clone, Debug)]
-pub struct NonDefaultSetConfig {
-	/// Name of the notifications protocols of this set. A substream on this set will be
-	/// considered established once this protocol is open.
-	///
-	/// > **Note**: This field isn't present for the default set, as this is handled internally
-	/// > by the networking code.
-	pub notifications_protocol: protocol::ProtocolName,
-	/// If the remote reports that it doesn't support the protocol indicated in the
-	/// `notifications_protocol` field, then each of these fallback names will be tried one by
-	/// one.
-	///
-	/// If a fallback is used, it will be reported in
-	/// `sc_network::protocol::event::Event::NotificationStreamOpened::negotiated_fallback`
-	pub fallback_names: Vec<protocol::ProtocolName>,
-	/// Handshake of the protocol
-	///
-	/// NOTE: Currently custom handshakes are not fully supported. See issue #5685 for more
-	/// details. This field is temporarily used to allow moving the hardcoded block announcement
-	/// protocol out of `protocol.rs`.
-	pub handshake: Option<NotificationHandshake>,
-	/// Maximum allowed size of single notifications.
-	pub max_notification_size: u64,
-	/// Base configuration.
-	pub set_config: SetConfig,
-}
-
-impl NonDefaultSetConfig {
-	/// Creates a new [`NonDefaultSetConfig`]. Zero slots and accepts only reserved nodes.
-	pub fn new(notifications_protocol: protocol::ProtocolName, max_notification_size: u64) -> Self {
-		Self {
-			notifications_protocol,
-			max_notification_size,
-			fallback_names: Vec::new(),
-			handshake: None,
-			set_config: SetConfig {
-				in_peers: 0,
-				out_peers: 0,
-				reserved_nodes: Vec::new(),
-				non_reserved_mode: NonReservedPeerMode::Deny,
-			},
-		}
-	}
-
-	/// Modifies the configuration to allow non-reserved nodes.
-	pub fn allow_non_reserved(&mut self, in_peers: u32, out_peers: u32) {
-		self.set_config.in_peers = in_peers;
-		self.set_config.out_peers = out_peers;
-		self.set_config.non_reserved_mode = NonReservedPeerMode::Accept;
-	}
-
-	/// Add a node to the list of reserved nodes.
-	pub fn add_reserved(&mut self, peer: MultiaddrWithPeerId) {
-		self.set_config.reserved_nodes.push(peer);
-	}
-
-	/// Add a list of protocol names used for backward compatibility.
-	///
-	/// See the explanations in [`NonDefaultSetConfig::fallback_names`].
-	pub fn add_fallback_names(&mut self, fallback_names: Vec<protocol::ProtocolName>) {
-		self.fallback_names.extend(fallback_names);
-	}
-}
-
-/// Configuration for the transport layer.
-#[derive(Clone, Debug)]
-pub enum TransportConfig {
-	/// Normal transport mode.
-	Normal {
-		/// If true, the network will use mDNS to discover other libp2p nodes on the local network
-		/// and connect to them if they support the same chain.
-		enable_mdns: bool,
-
-		/// If true, allow connecting to private IPv4/IPv6 addresses (as defined in
-		/// [RFC1918](https://tools.ietf.org/html/rfc1918)). Irrelevant for addresses that have
-		/// been passed in `::sc_network::config::NetworkConfiguration::boot_nodes`.
-		allow_private_ip: bool,
-	},
-
-	/// Only allow connections within the same process.
-	/// Only addresses of the form `/memory/...` will be supported.
-	MemoryOnly,
-}
-
-/// The policy for connections to non-reserved peers.
-#[derive(Clone, Debug, PartialEq, Eq)]
-pub enum NonReservedPeerMode {
-	/// Accept them. This is the default.
-	Accept,
-	/// Deny them.
-	Deny,
-}
-
-impl NonReservedPeerMode {
-	/// Attempt to parse the peer mode from a string.
-	pub fn parse(s: &str) -> Option<Self> {
-		match s {
-			"accept" => Some(Self::Accept),
-			"deny" => Some(Self::Deny),
-			_ => None,
-		}
-	}
-}
-
-/// Sync operation mode.
-#[derive(Copy, Clone, Debug, Eq, PartialEq)]
-pub enum SyncMode {
-	/// Full block download and verification.
-	Full,
-	/// Download blocks and the latest state.
-	Fast {
-		/// Skip state proof download and verification.
-		skip_proofs: bool,
-		/// Download indexed transactions for recent blocks.
-		storage_chain_mode: bool,
-	},
-	/// Warp sync - verify authority set transitions and the latest state.
-	Warp,
-}
-
-impl SyncMode {
-	/// Returns if `self` is [`Self::Warp`].
-	pub fn is_warp(&self) -> bool {
-		matches!(self, Self::Warp)
-	}
-
-	/// Returns if `self` is [`Self::Fast`].
-	pub fn is_fast(&self) -> bool {
-		matches!(self, Self::Fast { .. })
-	}
-}
-
-impl Default for SyncMode {
-	fn default() -> Self {
-		Self::Full
-	}
-}
-
-/// Network service configuration.
-#[derive(Clone, Debug)]
-pub struct NetworkConfiguration {
-	/// Directory path to store network-specific configuration. None means nothing will be saved.
-	pub net_config_path: Option<PathBuf>,
-	/// Multiaddresses to listen for incoming connections.
-	pub listen_addresses: Vec<Multiaddr>,
-	/// Multiaddresses to advertise. Detected automatically if empty.
-	pub public_addresses: Vec<Multiaddr>,
-	/// List of initial node addresses
-	pub boot_nodes: Vec<MultiaddrWithPeerId>,
-	/// The node key configuration, which determines the node's network identity keypair.
-	pub node_key: NodeKeyConfig,
-	/// List of request-response protocols that the node supports.
-	pub request_response_protocols: Vec<RequestResponseConfig>,
-	/// Configuration for the default set of nodes used for block syncing and transactions.
-	pub default_peers_set: SetConfig,
-	/// Number of substreams to reserve for full nodes for block syncing and transactions.
-	/// Any other slot will be dedicated to light nodes.
-	///
-	/// This value is implicitly capped to `default_set.out_peers + default_set.in_peers`.
-	pub default_peers_set_num_full: u32,
-	/// Configuration for extra sets of nodes.
-	pub extra_sets: Vec<NonDefaultSetConfig>,
-	/// Client identifier. Sent over the wire for debugging purposes.
-	pub client_version: String,
-	/// Name of the node. Sent over the wire for debugging purposes.
-	pub node_name: String,
-	/// Configuration for the transport layer.
-	pub transport: TransportConfig,
-	/// Maximum number of peers to ask the same blocks in parallel.
-	pub max_parallel_downloads: u32,
-	/// Initial syncing mode.
-	pub sync_mode: SyncMode,
-
-	/// True if Kademlia random discovery should be enabled.
-	///
-	/// If true, the node will automatically randomly walk the DHT in order to find new peers.
-	pub enable_dht_random_walk: bool,
-
-	/// Should we insert non-global addresses into the DHT?
-	pub allow_non_globals_in_dht: bool,
-
-	/// Require iterative Kademlia DHT queries to use disjoint paths for increased resiliency in
-	/// the presence of potentially adversarial nodes.
-	pub kademlia_disjoint_query_paths: bool,
-	/// Enable serving block data over IPFS bitswap.
-	pub ipfs_server: bool,
-
-	/// Size of Yamux receive window of all substreams. `None` for the default (256kiB).
-	/// Any value less than 256kiB is invalid.
-	///
-	/// # Context
-	///
-	/// By design, notifications substreams on top of Yamux connections only allow up to `N` bytes
-	/// to be transferred at a time, where `N` is the Yamux receive window size configurable here.
-	/// This means, in practice, that every `N` bytes must be acknowledged by the receiver before
-	/// the sender can send more data. The maximum bandwidth of each notifications substream is
-	/// therefore `N / round_trip_time`.
-	///
-	/// It is recommended to leave this to `None`, and use a request-response protocol instead if
-	/// a large amount of data must be transferred. The reason why the value is configurable is
-	/// that some Substrate users mis-use notification protocols to send large amounts of data.
-	/// As such, this option isn't designed to stay and will likely get removed in the future.
-	///
-	/// Note that configuring a value here isn't a modification of the Yamux protocol, but rather
-	/// a modification of the way the implementation works. Different nodes with different
-	/// configured values remain compatible with each other.
-	pub yamux_window_size: Option<u32>,
-}
-
-impl NetworkConfiguration {
-	/// Create new default configuration
-	pub fn new<SN: Into<String>, SV: Into<String>>(
-		node_name: SN,
-		client_version: SV,
-		node_key: NodeKeyConfig,
-		net_config_path: Option<PathBuf>,
-	) -> Self {
-		let default_peers_set = SetConfig::default();
-		Self {
-			net_config_path,
-			listen_addresses: Vec::new(),
-			public_addresses: Vec::new(),
-			boot_nodes: Vec::new(),
-			node_key,
-			request_response_protocols: Vec::new(),
-			default_peers_set_num_full: default_peers_set.in_peers + default_peers_set.out_peers,
-			default_peers_set,
-			extra_sets: Vec::new(),
-			client_version: client_version.into(),
-			node_name: node_name.into(),
-			transport: TransportConfig::Normal { enable_mdns: false, allow_private_ip: true },
-			max_parallel_downloads: 5,
-			sync_mode: SyncMode::Full,
-			enable_dht_random_walk: true,
-			allow_non_globals_in_dht: false,
-			kademlia_disjoint_query_paths: false,
-			yamux_window_size: None,
-			ipfs_server: false,
-		}
-	}
-
-	/// Create new default configuration for localhost-only connection with random port (useful for
-	/// testing)
-	pub fn new_local() -> NetworkConfiguration {
-		let mut config =
-			NetworkConfiguration::new("test-node", "test-client", Default::default(), None);
-
-		config.listen_addresses =
-			vec![iter::once(multiaddr::Protocol::Ip4(Ipv4Addr::new(127, 0, 0, 1)))
-				.chain(iter::once(multiaddr::Protocol::Tcp(0)))
-				.collect()];
-
-		config.allow_non_globals_in_dht = true;
-		config
-	}
-
-	/// Create new default configuration for localhost-only connection with random port (useful for
-	/// testing)
-	pub fn new_memory() -> NetworkConfiguration {
-		let mut config =
-			NetworkConfiguration::new("test-node", "test-client", Default::default(), None);
-
-		config.listen_addresses =
-			vec![iter::once(multiaddr::Protocol::Ip4(Ipv4Addr::new(127, 0, 0, 1)))
-				.chain(iter::once(multiaddr::Protocol::Tcp(0)))
-				.collect()];
-
-		config.allow_non_globals_in_dht = true;
-		config
-	}
-}
-
-/// The configuration of a node's secret key, describing the type of key
-/// and how it is obtained. A node's identity keypair is the result of
-/// the evaluation of the node key configuration.
-#[derive(Clone, Debug)]
-pub enum NodeKeyConfig {
-	/// A Ed25519 secret key configuration.
-	Ed25519(Secret<ed25519::SecretKey>),
-}
-
-impl Default for NodeKeyConfig {
-	fn default() -> NodeKeyConfig {
-		Self::Ed25519(Secret::New)
-	}
-}
-
-/// The options for obtaining a Ed25519 secret key.
-pub type Ed25519Secret = Secret<ed25519::SecretKey>;
-
-/// The configuration options for obtaining a secret key `K`.
-#[derive(Clone)]
-pub enum Secret<K> {
-	/// Use the given secret key `K`.
-	Input(K),
-	/// Read the secret key from a file. If the file does not exist,
-	/// it is created with a newly generated secret key `K`. The format
-	/// of the file is determined by `K`:
-	///
-	///   * `ed25519::SecretKey`: An unencoded 32 bytes Ed25519 secret key.
-	File(PathBuf),
-	/// Always generate a new secret key `K`.
-	New,
-}
-
-impl<K> fmt::Debug for Secret<K> {
-	fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-		match self {
-			Self::Input(_) => f.debug_tuple("Secret::Input").finish(),
-			Self::File(path) => f.debug_tuple("Secret::File").field(path).finish(),
-			Self::New => f.debug_tuple("Secret::New").finish(),
-		}
-	}
-}
-
-impl NodeKeyConfig {
-	/// Evaluate a `NodeKeyConfig` to obtain an identity `Keypair`:
-	///
-	///  * If the secret is configured as input, the corresponding keypair is returned.
-	///
-	///  * If the secret is configured as a file, it is read from that file, if it exists. Otherwise
-	///    a new secret is generated and stored. In either case, the keypair obtained from the
-	///    secret is returned.
-	///
-	///  * If the secret is configured to be new, it is generated and the corresponding keypair is
-	///    returned.
-	pub fn into_keypair(self) -> io::Result<Keypair> {
-		use NodeKeyConfig::*;
-		match self {
-			Ed25519(Secret::New) => Ok(Keypair::generate_ed25519()),
-
-			Ed25519(Secret::Input(k)) => Ok(Keypair::Ed25519(k.into())),
-
-			Ed25519(Secret::File(f)) => get_secret(
-				f,
-				|mut b| match String::from_utf8(b.to_vec()).ok().and_then(|s| {
-					if s.len() == 64 {
-						array_bytes::hex2bytes(&s).ok()
-					} else {
-						None
-					}
-				}) {
-					Some(s) => ed25519::SecretKey::from_bytes(s),
-					_ => ed25519::SecretKey::from_bytes(&mut b),
-				},
-				ed25519::SecretKey::generate,
-				|b| b.as_ref().to_vec(),
-			)
-			.map(ed25519::Keypair::from)
-			.map(Keypair::Ed25519),
-		}
-	}
-}
-
-/// Load a secret key from a file, if it exists, or generate a
-/// new secret key and write it to that file. In either case,
-/// the secret key is returned.
-fn get_secret<P, F, G, E, W, K>(file: P, parse: F, generate: G, serialize: W) -> io::Result<K>
-where
-	P: AsRef<Path>,
-	F: for<'r> FnOnce(&'r mut [u8]) -> Result<K, E>,
-	G: FnOnce() -> K,
-	E: Error + Send + Sync + 'static,
-	W: Fn(&K) -> Vec<u8>,
-{
-	std::fs::read(&file)
-		.and_then(|mut sk_bytes| {
-			parse(&mut sk_bytes).map_err(|e| io::Error::new(io::ErrorKind::InvalidData, e))
-		})
-		.or_else(|e| {
-			if e.kind() == io::ErrorKind::NotFound {
-				file.as_ref().parent().map_or(Ok(()), fs::create_dir_all)?;
-				let sk = generate();
-				let mut sk_vec = serialize(&sk);
-				write_secret_file(file, &sk_vec)?;
-				sk_vec.zeroize();
-				Ok(sk)
-			} else {
-				Err(e)
-			}
-		})
-}
-
-/// Write secret bytes to a file.
-fn write_secret_file<P>(path: P, sk_bytes: &[u8]) -> io::Result<()>
-where
-	P: AsRef<Path>,
-{
-	let mut file = open_secret_file(&path)?;
-	file.write_all(sk_bytes)
-}
-
-/// Opens a file containing a secret key in write mode.
-#[cfg(unix)]
-fn open_secret_file<P>(path: P) -> io::Result<fs::File>
-where
-	P: AsRef<Path>,
-{
-	use std::os::unix::fs::OpenOptionsExt;
-	fs::OpenOptions::new().write(true).create_new(true).mode(0o600).open(path)
-}
-
-/// Opens a file containing a secret key in write mode.
-#[cfg(not(unix))]
-fn open_secret_file<P>(path: P) -> Result<fs::File, io::Error>
-where
-	P: AsRef<Path>,
-{
-	fs::OpenOptions::new().write(true).create_new(true).open(path)
-}
-
-#[cfg(test)]
-mod tests {
-	use super::*;
-	use tempfile::TempDir;
-
-	fn tempdir_with_prefix(prefix: &str) -> TempDir {
-		tempfile::Builder::new().prefix(prefix).tempdir().unwrap()
-	}
-
-	fn secret_bytes(kp: &Keypair) -> Vec<u8> {
-		let Keypair::Ed25519(p) = kp;
-		p.secret().as_ref().iter().cloned().collect()
-	}
-
-	#[test]
-	fn test_secret_file() {
-		let tmp = tempdir_with_prefix("x");
-		std::fs::remove_dir(tmp.path()).unwrap(); // should be recreated
-		let file = tmp.path().join("x").to_path_buf();
-		let kp1 = NodeKeyConfig::Ed25519(Secret::File(file.clone())).into_keypair().unwrap();
-		let kp2 = NodeKeyConfig::Ed25519(Secret::File(file.clone())).into_keypair().unwrap();
-		assert!(file.is_file() && secret_bytes(&kp1) == secret_bytes(&kp2))
-	}
-
-	#[test]
-	fn test_secret_input() {
-		let sk = ed25519::SecretKey::generate();
-		let kp1 = NodeKeyConfig::Ed25519(Secret::Input(sk.clone())).into_keypair().unwrap();
-		let kp2 = NodeKeyConfig::Ed25519(Secret::Input(sk)).into_keypair().unwrap();
-		assert!(secret_bytes(&kp1) == secret_bytes(&kp2));
-	}
-
-	#[test]
-	fn test_secret_new() {
-		let kp1 = NodeKeyConfig::Ed25519(Secret::New).into_keypair().unwrap();
-		let kp2 = NodeKeyConfig::Ed25519(Secret::New).into_keypair().unwrap();
-		assert!(secret_bytes(&kp1) != secret_bytes(&kp2));
-	}
-}
diff --git a/substrate/client/network/common/src/lib.rs b/substrate/client/network/common/src/lib.rs
index 10d2449388bb926c3469fa2b2b6c610cbd6f5596..f53590efd4c843f19f9edfeaf49623e4eb9cf464 100644
--- a/substrate/client/network/common/src/lib.rs
+++ b/substrate/client/network/common/src/lib.rs
@@ -18,14 +18,9 @@
 
 //! Common data structures of the networking layer.
 
-pub mod config;
-pub mod error;
 pub mod message;
-pub mod protocol;
-pub mod request_responses;
-pub mod service;
+pub mod role;
 pub mod sync;
-pub mod utils;
 
 /// Minimum Requirements for a Hash within Networking
 pub trait ExHashT: std::hash::Hash + Eq + std::fmt::Debug + Clone + Send + Sync + 'static {}
diff --git a/substrate/client/network/common/src/request_responses.rs b/substrate/client/network/common/src/request_responses.rs
deleted file mode 100644
index 4fa53a736ac3357305c3963f39d40427cc9d5e23..0000000000000000000000000000000000000000
--- a/substrate/client/network/common/src/request_responses.rs
+++ /dev/null
@@ -1,155 +0,0 @@
-// This file is part of Substrate.
-
-// Copyright (C) Parity Technologies (UK) Ltd.
-// SPDX-License-Identifier: GPL-3.0-or-later WITH Classpath-exception-2.0
-
-// This program is free software: you can redistribute it and/or modify
-// it under the terms of the GNU General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-
-// This program is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-// GNU General Public License for more details.
-
-// You should have received a copy of the GNU General Public License
-// along with this program. If not, see <https://www.gnu.org/licenses/>.
-
-//! Collection of generic data structures for request-response protocols.
-
-use crate::protocol::ProtocolName;
-use futures::channel::{mpsc, oneshot};
-use libp2p::{request_response::OutboundFailure, PeerId};
-use sc_peerset::ReputationChange;
-use std::time::Duration;
-
-/// Configuration for a single request-response protocol.
-#[derive(Debug, Clone)]
-pub struct ProtocolConfig {
-	/// Name of the protocol on the wire. Should be something like `/foo/bar`.
-	pub name: ProtocolName,
-
-	/// Fallback on the wire protocol names to support.
-	pub fallback_names: Vec<ProtocolName>,
-
-	/// Maximum allowed size, in bytes, of a request.
-	///
-	/// Any request larger than this value will be declined as a way to avoid allocating too
-	/// much memory for it.
-	pub max_request_size: u64,
-
-	/// Maximum allowed size, in bytes, of a response.
-	///
-	/// Any response larger than this value will be declined as a way to avoid allocating too
-	/// much memory for it.
-	pub max_response_size: u64,
-
-	/// Duration after which emitted requests are considered timed out.
-	///
-	/// If you expect the response to come back quickly, you should set this to a smaller duration.
-	pub request_timeout: Duration,
-
-	/// Channel on which the networking service will send incoming requests.
-	///
-	/// Every time a peer sends a request to the local node using this protocol, the networking
-	/// service will push an element on this channel. The receiving side of this channel then has
-	/// to pull this element, process the request, and send back the response to send back to the
-	/// peer.
-	///
-	/// The size of the channel has to be carefully chosen. If the channel is full, the networking
-	/// service will discard the incoming request send back an error to the peer. Consequently,
-	/// the channel being full is an indicator that the node is overloaded.
-	///
-	/// You can typically set the size of the channel to `T / d`, where `T` is the
-	/// `request_timeout` and `d` is the expected average duration of CPU and I/O it takes to
-	/// build a response.
-	///
-	/// Can be `None` if the local node does not support answering incoming requests.
-	/// If this is `None`, then the local node will not advertise support for this protocol towards
-	/// other peers. If this is `Some` but the channel is closed, then the local node will
-	/// advertise support for this protocol, but any incoming request will lead to an error being
-	/// sent back.
-	pub inbound_queue: Option<mpsc::Sender<IncomingRequest>>,
-}
-
-/// A single request received by a peer on a request-response protocol.
-#[derive(Debug)]
-pub struct IncomingRequest {
-	/// Who sent the request.
-	pub peer: PeerId,
-
-	/// Request sent by the remote. Will always be smaller than
-	/// [`ProtocolConfig::max_request_size`].
-	pub payload: Vec<u8>,
-
-	/// Channel to send back the response.
-	///
-	/// There are two ways to indicate that handling the request failed:
-	///
-	/// 1. Drop `pending_response` and thus not changing the reputation of the peer.
-	///
-	/// 2. Sending an `Err(())` via `pending_response`, optionally including reputation changes for
-	/// the given peer.
-	pub pending_response: oneshot::Sender<OutgoingResponse>,
-}
-
-/// Response for an incoming request to be send by a request protocol handler.
-#[derive(Debug)]
-pub struct OutgoingResponse {
-	/// The payload of the response.
-	///
-	/// `Err(())` if none is available e.g. due an error while handling the request.
-	pub result: Result<Vec<u8>, ()>,
-
-	/// Reputation changes accrued while handling the request. To be applied to the reputation of
-	/// the peer sending the request.
-	pub reputation_changes: Vec<ReputationChange>,
-
-	/// If provided, the `oneshot::Sender` will be notified when the request has been sent to the
-	/// peer.
-	///
-	/// > **Note**: Operating systems typically maintain a buffer of a few dozen kilobytes of
-	/// >			outgoing data for each TCP socket, and it is not possible for a user
-	/// >			application to inspect this buffer. This channel here is not actually notified
-	/// >			when the response has been fully sent out, but rather when it has fully been
-	/// >			written to the buffer managed by the operating system.
-	pub sent_feedback: Option<oneshot::Sender<()>>,
-}
-
-/// When sending a request, what to do on a disconnected recipient.
-#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
-pub enum IfDisconnected {
-	/// Try to connect to the peer.
-	TryConnect,
-	/// Just fail if the destination is not yet connected.
-	ImmediateError,
-}
-
-/// Convenience functions for `IfDisconnected`.
-impl IfDisconnected {
-	/// Shall we connect to a disconnected peer?
-	pub fn should_connect(self) -> bool {
-		match self {
-			Self::TryConnect => true,
-			Self::ImmediateError => false,
-		}
-	}
-}
-
-/// Error in a request.
-#[derive(Debug, thiserror::Error)]
-#[allow(missing_docs)]
-pub enum RequestFailure {
-	#[error("We are not currently connected to the requested peer.")]
-	NotConnected,
-	#[error("Given protocol hasn't been registered.")]
-	UnknownProtocol,
-	#[error("Remote has closed the substream before answering, thereby signaling that it considers the request as valid, but refused to answer it.")]
-	Refused,
-	#[error("The remote replied, but the local node is no longer interested in the response.")]
-	Obsolete,
-	/// Problem on the network.
-	#[error("Problem on the network: {0}")]
-	Network(OutboundFailure),
-}
diff --git a/substrate/client/network/common/src/protocol/role.rs b/substrate/client/network/common/src/role.rs
similarity index 100%
rename from substrate/client/network/common/src/protocol/role.rs
rename to substrate/client/network/common/src/role.rs
diff --git a/substrate/client/network/common/src/sync.rs b/substrate/client/network/common/src/sync.rs
index 262da6c202aa388d4eb945908e6ca5423f529c3d..130f354b70050dc3e08dd24bbede12981c0709e1 100644
--- a/substrate/client/network/common/src/sync.rs
+++ b/substrate/client/network/common/src/sync.rs
@@ -22,7 +22,7 @@ pub mod message;
 pub mod metrics;
 pub mod warp;
 
-use crate::protocol::role::Roles;
+use crate::role::Roles;
 use futures::Stream;
 
 use libp2p::PeerId;
diff --git a/substrate/client/network/common/src/sync/message.rs b/substrate/client/network/common/src/sync/message.rs
index 7b8be18bda5cc9b48a2b919b631c03a67ab8c011..c651660c89c8dfcb776cd25d58f75e439689f8d0 100644
--- a/substrate/client/network/common/src/sync/message.rs
+++ b/substrate/client/network/common/src/sync/message.rs
@@ -19,7 +19,7 @@
 //! Network packet message types. These get serialized and put into the lower level protocol
 //! payload.
 
-use crate::protocol::role::Roles;
+use crate::role::Roles;
 
 use bitflags::bitflags;
 use codec::{Decode, Encode, Error, Input, Output};
diff --git a/substrate/client/network/light/Cargo.toml b/substrate/client/network/light/Cargo.toml
index f3e94790df61e0ed0f0311aedcab5f79d8b02abf..ed2a5d6cb4ec6b7d682edc6fe13a682347fa27ae 100644
--- a/substrate/client/network/light/Cargo.toml
+++ b/substrate/client/network/light/Cargo.toml
@@ -26,6 +26,7 @@ log = "0.4.16"
 prost = "0.11"
 sp-blockchain = { version = "4.0.0-dev", path = "../../../primitives/blockchain" }
 sc-client-api = { version = "4.0.0-dev", path = "../../api" }
+sc-network = { version = "0.10.0-dev", path = "../" }
 sc-network-common = { version = "0.10.0-dev", path = "../common" }
 sc-peerset = { version = "4.0.0-dev", path = "../../peerset" }
 sp-core = { version = "7.0.0", path = "../../../primitives/core" }
diff --git a/substrate/client/network/light/src/light_client_requests.rs b/substrate/client/network/light/src/light_client_requests.rs
index 5b6daf174cce6ca355483039f7a256c372f9f81d..4d2a301c00e6b491e204f008ca0393608e966933 100644
--- a/substrate/client/network/light/src/light_client_requests.rs
+++ b/substrate/client/network/light/src/light_client_requests.rs
@@ -18,13 +18,13 @@
 
 //! Helpers for outgoing and incoming light client requests.
 
-/// For incoming light client requests.
-pub mod handler;
-
-use sc_network_common::{config::ProtocolId, request_responses::ProtocolConfig};
+use sc_network::{config::ProtocolId, request_responses::ProtocolConfig};
 
 use std::time::Duration;
 
+/// For incoming light client requests.
+pub mod handler;
+
 /// Generate the light client protocol name from the genesis hash and fork id.
 fn generate_protocol_name<Hash: AsRef<[u8]>>(genesis_hash: Hash, fork_id: Option<&str>) -> String {
 	let genesis_hash = genesis_hash.as_ref();
diff --git a/substrate/client/network/light/src/light_client_requests/handler.rs b/substrate/client/network/light/src/light_client_requests/handler.rs
index 0a1215a1dc6a9b5215117d5220773102a9b74c2f..db2630b79f4981aa9cf16e9d73313e0dd3d54092 100644
--- a/substrate/client/network/light/src/light_client_requests/handler.rs
+++ b/substrate/client/network/light/src/light_client_requests/handler.rs
@@ -29,7 +29,7 @@ use libp2p::PeerId;
 use log::{debug, trace};
 use prost::Message;
 use sc_client_api::{BlockBackend, ProofProvider};
-use sc_network_common::{
+use sc_network::{
 	config::ProtocolId,
 	request_responses::{IncomingRequest, OutgoingResponse, ProtocolConfig},
 };
diff --git a/substrate/client/network/src/behaviour.rs b/substrate/client/network/src/behaviour.rs
index 55912902003619e7d07e0e6c0358274a63415305..f068099928efc887dcdd3595efd29117568c8401 100644
--- a/substrate/client/network/src/behaviour.rs
+++ b/substrate/client/network/src/behaviour.rs
@@ -18,9 +18,11 @@
 
 use crate::{
 	discovery::{DiscoveryBehaviour, DiscoveryConfig, DiscoveryOut},
+	event::DhtEvent,
 	peer_info,
 	protocol::{CustomMessageOutcome, NotificationsSink, Protocol},
-	request_responses,
+	request_responses::{self, IfDisconnected, ProtocolConfig, RequestFailure},
+	types::ProtocolName,
 };
 
 use bytes::Bytes;
@@ -32,14 +34,7 @@ use libp2p::{
 	swarm::NetworkBehaviour,
 };
 
-use sc_network_common::{
-	protocol::{
-		event::DhtEvent,
-		role::{ObservedRole, Roles},
-		ProtocolName,
-	},
-	request_responses::{IfDisconnected, ProtocolConfig, RequestFailure},
-};
+use sc_network_common::role::{ObservedRole, Roles};
 use sc_peerset::{PeersetHandle, ReputationChange};
 use sp_runtime::traits::Block as BlockT;
 use std::{collections::HashSet, time::Duration};
diff --git a/substrate/client/network/src/config.rs b/substrate/client/network/src/config.rs
index 90d02af848bf405cb5bf134e3f202f6e81b329f0..925a7795d290f44449ea17210fb59d0425061879 100644
--- a/substrate/client/network/src/config.rs
+++ b/substrate/client/network/src/config.rs
@@ -21,21 +21,671 @@
 //! The [`Params`] struct is the struct that must be passed in order to initialize the networking.
 //! See the documentation of [`Params`].
 
-pub use sc_network_common::{
-	config::{NetworkConfiguration, ProtocolId},
-	protocol::role::Role,
+pub use crate::{
 	request_responses::{
 		IncomingRequest, OutgoingResponse, ProtocolConfig as RequestResponseConfig,
 	},
-	sync::warp::WarpSyncProvider,
-	ExHashT,
+	types::ProtocolName,
 };
 
-pub use libp2p::{build_multiaddr, core::PublicKey, identity};
-
+use codec::Encode;
+use libp2p::{identity::Keypair, multiaddr, Multiaddr, PeerId};
 use prometheus_endpoint::Registry;
-use sc_network_common::config::NonDefaultSetConfig;
-use std::{future::Future, pin::Pin, sync::Arc};
+pub use sc_network_common::{role::Role, sync::warp::WarpSyncProvider, ExHashT};
+use zeroize::Zeroize;
+
+use std::{
+	error::Error,
+	fmt, fs,
+	future::Future,
+	io::{self, Write},
+	iter,
+	net::Ipv4Addr,
+	path::{Path, PathBuf},
+	pin::Pin,
+	str::{self, FromStr},
+	sync::Arc,
+};
+
+pub use libp2p::{
+	build_multiaddr,
+	identity::{self, ed25519},
+};
+
+/// Protocol name prefix, transmitted on the wire for legacy protocol names.
+/// I.e., `dot` in `/dot/sync/2`. Should be unique for each chain. Always UTF-8.
+/// Deprecated in favour of genesis hash & fork ID based protocol names.
+#[derive(Clone, PartialEq, Eq, Hash)]
+pub struct ProtocolId(smallvec::SmallVec<[u8; 6]>);
+
+impl<'a> From<&'a str> for ProtocolId {
+	fn from(bytes: &'a str) -> ProtocolId {
+		Self(bytes.as_bytes().into())
+	}
+}
+
+impl AsRef<str> for ProtocolId {
+	fn as_ref(&self) -> &str {
+		str::from_utf8(&self.0[..])
+			.expect("the only way to build a ProtocolId is through a UTF-8 String; qed")
+	}
+}
+
+impl fmt::Debug for ProtocolId {
+	fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+		fmt::Debug::fmt(self.as_ref(), f)
+	}
+}
+
+/// Parses a string address and splits it into Multiaddress and PeerId, if
+/// valid.
+///
+/// # Example
+///
+/// ```
+/// # use libp2p::{Multiaddr, PeerId};
+/// use sc_network::config::parse_str_addr;
+/// let (peer_id, addr) = parse_str_addr(
+/// 	"/ip4/198.51.100.19/tcp/30333/p2p/QmSk5HQbn6LhUwDiNMseVUjuRYhEtYj4aUZ6WfWoGURpdV"
+/// ).unwrap();
+/// assert_eq!(peer_id, "QmSk5HQbn6LhUwDiNMseVUjuRYhEtYj4aUZ6WfWoGURpdV".parse::<PeerId>().unwrap());
+/// assert_eq!(addr, "/ip4/198.51.100.19/tcp/30333".parse::<Multiaddr>().unwrap());
+/// ```
+pub fn parse_str_addr(addr_str: &str) -> Result<(PeerId, Multiaddr), ParseErr> {
+	let addr: Multiaddr = addr_str.parse()?;
+	parse_addr(addr)
+}
+
+/// Splits a Multiaddress into a Multiaddress and PeerId.
+pub fn parse_addr(mut addr: Multiaddr) -> Result<(PeerId, Multiaddr), ParseErr> {
+	let who = match addr.pop() {
+		Some(multiaddr::Protocol::P2p(key)) =>
+			PeerId::from_multihash(key).map_err(|_| ParseErr::InvalidPeerId)?,
+		_ => return Err(ParseErr::PeerIdMissing),
+	};
+
+	Ok((who, addr))
+}
+
+/// Address of a node, including its identity.
+///
+/// This struct represents a decoded version of a multiaddress that ends with `/p2p/<peerid>`.
+///
+/// # Example
+///
+/// ```
+/// # use libp2p::{Multiaddr, PeerId};
+/// use sc_network::config::MultiaddrWithPeerId;
+/// let addr: MultiaddrWithPeerId =
+/// 	"/ip4/198.51.100.19/tcp/30333/p2p/QmSk5HQbn6LhUwDiNMseVUjuRYhEtYj4aUZ6WfWoGURpdV".parse().unwrap();
+/// assert_eq!(addr.peer_id.to_base58(), "QmSk5HQbn6LhUwDiNMseVUjuRYhEtYj4aUZ6WfWoGURpdV");
+/// assert_eq!(addr.multiaddr.to_string(), "/ip4/198.51.100.19/tcp/30333");
+/// ```
+#[derive(Debug, Clone, serde::Serialize, serde::Deserialize, PartialEq)]
+#[serde(try_from = "String", into = "String")]
+pub struct MultiaddrWithPeerId {
+	/// Address of the node.
+	pub multiaddr: Multiaddr,
+	/// Its identity.
+	pub peer_id: PeerId,
+}
+
+impl MultiaddrWithPeerId {
+	/// Concatenates the multiaddress and peer ID into one multiaddress containing both.
+	pub fn concat(&self) -> Multiaddr {
+		let proto = multiaddr::Protocol::P2p(From::from(self.peer_id));
+		self.multiaddr.clone().with(proto)
+	}
+}
+
+impl fmt::Display for MultiaddrWithPeerId {
+	fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+		fmt::Display::fmt(&self.concat(), f)
+	}
+}
+
+impl FromStr for MultiaddrWithPeerId {
+	type Err = ParseErr;
+
+	fn from_str(s: &str) -> Result<Self, Self::Err> {
+		let (peer_id, multiaddr) = parse_str_addr(s)?;
+		Ok(Self { peer_id, multiaddr })
+	}
+}
+
+impl From<MultiaddrWithPeerId> for String {
+	fn from(ma: MultiaddrWithPeerId) -> String {
+		format!("{}", ma)
+	}
+}
+
+impl TryFrom<String> for MultiaddrWithPeerId {
+	type Error = ParseErr;
+	fn try_from(string: String) -> Result<Self, Self::Error> {
+		string.parse()
+	}
+}
+
+/// Error that can be generated by `parse_str_addr`.
+#[derive(Debug)]
+pub enum ParseErr {
+	/// Error while parsing the multiaddress.
+	MultiaddrParse(multiaddr::Error),
+	/// Multihash of the peer ID is invalid.
+	InvalidPeerId,
+	/// The peer ID is missing from the address.
+	PeerIdMissing,
+}
+
+impl fmt::Display for ParseErr {
+	fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+		match self {
+			Self::MultiaddrParse(err) => write!(f, "{}", err),
+			Self::InvalidPeerId => write!(f, "Peer id at the end of the address is invalid"),
+			Self::PeerIdMissing => write!(f, "Peer id is missing from the address"),
+		}
+	}
+}
+
+impl std::error::Error for ParseErr {
+	fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
+		match self {
+			Self::MultiaddrParse(err) => Some(err),
+			Self::InvalidPeerId => None,
+			Self::PeerIdMissing => None,
+		}
+	}
+}
+
+impl From<multiaddr::Error> for ParseErr {
+	fn from(err: multiaddr::Error) -> ParseErr {
+		Self::MultiaddrParse(err)
+	}
+}
+
+/// Custom handshake for the notification protocol
+#[derive(Debug, Clone)]
+pub struct NotificationHandshake(Vec<u8>);
+
+impl NotificationHandshake {
+	/// Create new `NotificationHandshake` from an object that implements `Encode`
+	pub fn new<H: Encode>(handshake: H) -> Self {
+		Self(handshake.encode())
+	}
+
+	/// Create new `NotificationHandshake` from raw bytes
+	pub fn from_bytes(bytes: Vec<u8>) -> Self {
+		Self(bytes)
+	}
+}
+
+impl std::ops::Deref for NotificationHandshake {
+	type Target = Vec<u8>;
+
+	fn deref(&self) -> &Self::Target {
+		&self.0
+	}
+}
+
+/// Configuration for the transport layer.
+#[derive(Clone, Debug)]
+pub enum TransportConfig {
+	/// Normal transport mode.
+	Normal {
+		/// If true, the network will use mDNS to discover other libp2p nodes on the local network
+		/// and connect to them if they support the same chain.
+		enable_mdns: bool,
+
+		/// If true, allow connecting to private IPv4/IPv6 addresses (as defined in
+		/// [RFC1918](https://tools.ietf.org/html/rfc1918)). Irrelevant for addresses that have
+		/// been passed in `::sc_network::config::NetworkConfiguration::boot_nodes`.
+		allow_private_ip: bool,
+	},
+
+	/// Only allow connections within the same process.
+	/// Only addresses of the form `/memory/...` will be supported.
+	MemoryOnly,
+}
+
+/// The policy for connections to non-reserved peers.
+#[derive(Clone, Debug, PartialEq, Eq)]
+pub enum NonReservedPeerMode {
+	/// Accept them. This is the default.
+	Accept,
+	/// Deny them.
+	Deny,
+}
+
+impl NonReservedPeerMode {
+	/// Attempt to parse the peer mode from a string.
+	pub fn parse(s: &str) -> Option<Self> {
+		match s {
+			"accept" => Some(Self::Accept),
+			"deny" => Some(Self::Deny),
+			_ => None,
+		}
+	}
+}
+
+/// Sync operation mode.
+#[derive(Copy, Clone, Debug, Eq, PartialEq)]
+pub enum SyncMode {
+	/// Full block download and verification.
+	Full,
+	/// Download blocks and the latest state.
+	Fast {
+		/// Skip state proof download and verification.
+		skip_proofs: bool,
+		/// Download indexed transactions for recent blocks.
+		storage_chain_mode: bool,
+	},
+	/// Warp sync - verify authority set transitions and the latest state.
+	Warp,
+}
+
+impl SyncMode {
+	/// Returns if `self` is [`Self::Warp`].
+	pub fn is_warp(&self) -> bool {
+		matches!(self, Self::Warp)
+	}
+
+	/// Returns if `self` is [`Self::Fast`].
+	pub fn is_fast(&self) -> bool {
+		matches!(self, Self::Fast { .. })
+	}
+}
+
+impl Default for SyncMode {
+	fn default() -> Self {
+		Self::Full
+	}
+}
+
+/// The configuration of a node's secret key, describing the type of key
+/// and how it is obtained. A node's identity keypair is the result of
+/// the evaluation of the node key configuration.
+#[derive(Clone, Debug)]
+pub enum NodeKeyConfig {
+	/// A Ed25519 secret key configuration.
+	Ed25519(Secret<ed25519::SecretKey>),
+}
+
+impl Default for NodeKeyConfig {
+	fn default() -> NodeKeyConfig {
+		Self::Ed25519(Secret::New)
+	}
+}
+
+/// The options for obtaining a Ed25519 secret key.
+pub type Ed25519Secret = Secret<ed25519::SecretKey>;
+
+/// The configuration options for obtaining a secret key `K`.
+#[derive(Clone)]
+pub enum Secret<K> {
+	/// Use the given secret key `K`.
+	Input(K),
+	/// Read the secret key from a file. If the file does not exist,
+	/// it is created with a newly generated secret key `K`. The format
+	/// of the file is determined by `K`:
+	///
+	///   * `ed25519::SecretKey`: An unencoded 32 bytes Ed25519 secret key.
+	File(PathBuf),
+	/// Always generate a new secret key `K`.
+	New,
+}
+
+impl<K> fmt::Debug for Secret<K> {
+	fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+		match self {
+			Self::Input(_) => f.debug_tuple("Secret::Input").finish(),
+			Self::File(path) => f.debug_tuple("Secret::File").field(path).finish(),
+			Self::New => f.debug_tuple("Secret::New").finish(),
+		}
+	}
+}
+
+impl NodeKeyConfig {
+	/// Evaluate a `NodeKeyConfig` to obtain an identity `Keypair`:
+	///
+	///  * If the secret is configured as input, the corresponding keypair is returned.
+	///
+	///  * If the secret is configured as a file, it is read from that file, if it exists. Otherwise
+	///    a new secret is generated and stored. In either case, the keypair obtained from the
+	///    secret is returned.
+	///
+	///  * If the secret is configured to be new, it is generated and the corresponding keypair is
+	///    returned.
+	pub fn into_keypair(self) -> io::Result<Keypair> {
+		use NodeKeyConfig::*;
+		match self {
+			Ed25519(Secret::New) => Ok(Keypair::generate_ed25519()),
+
+			Ed25519(Secret::Input(k)) => Ok(Keypair::Ed25519(k.into())),
+
+			Ed25519(Secret::File(f)) => get_secret(
+				f,
+				|mut b| match String::from_utf8(b.to_vec()).ok().and_then(|s| {
+					if s.len() == 64 {
+						array_bytes::hex2bytes(&s).ok()
+					} else {
+						None
+					}
+				}) {
+					Some(s) => ed25519::SecretKey::from_bytes(s),
+					_ => ed25519::SecretKey::from_bytes(&mut b),
+				},
+				ed25519::SecretKey::generate,
+				|b| b.as_ref().to_vec(),
+			)
+			.map(ed25519::Keypair::from)
+			.map(Keypair::Ed25519),
+		}
+	}
+}
+
+/// Load a secret key from a file, if it exists, or generate a
+/// new secret key and write it to that file. In either case,
+/// the secret key is returned.
+fn get_secret<P, F, G, E, W, K>(file: P, parse: F, generate: G, serialize: W) -> io::Result<K>
+where
+	P: AsRef<Path>,
+	F: for<'r> FnOnce(&'r mut [u8]) -> Result<K, E>,
+	G: FnOnce() -> K,
+	E: Error + Send + Sync + 'static,
+	W: Fn(&K) -> Vec<u8>,
+{
+	std::fs::read(&file)
+		.and_then(|mut sk_bytes| {
+			parse(&mut sk_bytes).map_err(|e| io::Error::new(io::ErrorKind::InvalidData, e))
+		})
+		.or_else(|e| {
+			if e.kind() == io::ErrorKind::NotFound {
+				file.as_ref().parent().map_or(Ok(()), fs::create_dir_all)?;
+				let sk = generate();
+				let mut sk_vec = serialize(&sk);
+				write_secret_file(file, &sk_vec)?;
+				sk_vec.zeroize();
+				Ok(sk)
+			} else {
+				Err(e)
+			}
+		})
+}
+
+/// Write secret bytes to a file.
+fn write_secret_file<P>(path: P, sk_bytes: &[u8]) -> io::Result<()>
+where
+	P: AsRef<Path>,
+{
+	let mut file = open_secret_file(&path)?;
+	file.write_all(sk_bytes)
+}
+
+/// Opens a file containing a secret key in write mode.
+#[cfg(unix)]
+fn open_secret_file<P>(path: P) -> io::Result<fs::File>
+where
+	P: AsRef<Path>,
+{
+	use std::os::unix::fs::OpenOptionsExt;
+	fs::OpenOptions::new().write(true).create_new(true).mode(0o600).open(path)
+}
+
+/// Opens a file containing a secret key in write mode.
+#[cfg(not(unix))]
+fn open_secret_file<P>(path: P) -> Result<fs::File, io::Error>
+where
+	P: AsRef<Path>,
+{
+	fs::OpenOptions::new().write(true).create_new(true).open(path)
+}
+
+/// Configuration for a set of nodes.
+#[derive(Clone, Debug)]
+pub struct SetConfig {
+	/// Maximum allowed number of incoming substreams related to this set.
+	pub in_peers: u32,
+
+	/// Number of outgoing substreams related to this set that we're trying to maintain.
+	pub out_peers: u32,
+
+	/// List of reserved node addresses.
+	pub reserved_nodes: Vec<MultiaddrWithPeerId>,
+
+	/// Whether nodes that aren't in [`SetConfig::reserved_nodes`] are accepted or automatically
+	/// refused.
+	pub non_reserved_mode: NonReservedPeerMode,
+}
+
+impl Default for SetConfig {
+	fn default() -> Self {
+		Self {
+			in_peers: 25,
+			out_peers: 75,
+			reserved_nodes: Vec::new(),
+			non_reserved_mode: NonReservedPeerMode::Accept,
+		}
+	}
+}
+
+/// Extension to [`SetConfig`] for sets that aren't the default set.
+///
+/// > **Note**: As new fields might be added in the future, please consider using the `new` method
+/// >			and modifiers instead of creating this struct manually.
+#[derive(Clone, Debug)]
+pub struct NonDefaultSetConfig {
+	/// Name of the notifications protocols of this set. A substream on this set will be
+	/// considered established once this protocol is open.
+	///
+	/// > **Note**: This field isn't present for the default set, as this is handled internally
+	/// > by the networking code.
+	pub notifications_protocol: ProtocolName,
+
+	/// If the remote reports that it doesn't support the protocol indicated in the
+	/// `notifications_protocol` field, then each of these fallback names will be tried one by
+	/// one.
+	///
+	/// If a fallback is used, it will be reported in
+	/// `sc_network::protocol::event::Event::NotificationStreamOpened::negotiated_fallback`
+	pub fallback_names: Vec<ProtocolName>,
+
+	/// Handshake of the protocol
+	///
+	/// NOTE: Currently custom handshakes are not fully supported. See issue #5685 for more
+	/// details. This field is temporarily used to allow moving the hardcoded block announcement
+	/// protocol out of `protocol.rs`.
+	pub handshake: Option<NotificationHandshake>,
+
+	/// Maximum allowed size of single notifications.
+	pub max_notification_size: u64,
+
+	/// Base configuration.
+	pub set_config: SetConfig,
+}
+
+impl NonDefaultSetConfig {
+	/// Creates a new [`NonDefaultSetConfig`]. Zero slots and accepts only reserved nodes.
+	pub fn new(notifications_protocol: ProtocolName, max_notification_size: u64) -> Self {
+		Self {
+			notifications_protocol,
+			max_notification_size,
+			fallback_names: Vec::new(),
+			handshake: None,
+			set_config: SetConfig {
+				in_peers: 0,
+				out_peers: 0,
+				reserved_nodes: Vec::new(),
+				non_reserved_mode: NonReservedPeerMode::Deny,
+			},
+		}
+	}
+
+	/// Modifies the configuration to allow non-reserved nodes.
+	pub fn allow_non_reserved(&mut self, in_peers: u32, out_peers: u32) {
+		self.set_config.in_peers = in_peers;
+		self.set_config.out_peers = out_peers;
+		self.set_config.non_reserved_mode = NonReservedPeerMode::Accept;
+	}
+
+	/// Add a node to the list of reserved nodes.
+	pub fn add_reserved(&mut self, peer: MultiaddrWithPeerId) {
+		self.set_config.reserved_nodes.push(peer);
+	}
+
+	/// Add a list of protocol names used for backward compatibility.
+	///
+	/// See the explanations in [`NonDefaultSetConfig::fallback_names`].
+	pub fn add_fallback_names(&mut self, fallback_names: Vec<ProtocolName>) {
+		self.fallback_names.extend(fallback_names);
+	}
+}
+
+/// Network service configuration.
+#[derive(Clone, Debug)]
+pub struct NetworkConfiguration {
+	/// Directory path to store network-specific configuration. None means nothing will be saved.
+	pub net_config_path: Option<PathBuf>,
+
+	/// Multiaddresses to listen for incoming connections.
+	pub listen_addresses: Vec<Multiaddr>,
+
+	/// Multiaddresses to advertise. Detected automatically if empty.
+	pub public_addresses: Vec<Multiaddr>,
+
+	/// List of initial node addresses
+	pub boot_nodes: Vec<MultiaddrWithPeerId>,
+
+	/// The node key configuration, which determines the node's network identity keypair.
+	pub node_key: NodeKeyConfig,
+
+	/// List of request-response protocols that the node supports.
+	pub request_response_protocols: Vec<RequestResponseConfig>,
+	/// Configuration for the default set of nodes used for block syncing and transactions.
+	pub default_peers_set: SetConfig,
+
+	/// Number of substreams to reserve for full nodes for block syncing and transactions.
+	/// Any other slot will be dedicated to light nodes.
+	///
+	/// This value is implicitly capped to `default_set.out_peers + default_set.in_peers`.
+	pub default_peers_set_num_full: u32,
+
+	/// Configuration for extra sets of nodes.
+	pub extra_sets: Vec<NonDefaultSetConfig>,
+
+	/// Client identifier. Sent over the wire for debugging purposes.
+	pub client_version: String,
+
+	/// Name of the node. Sent over the wire for debugging purposes.
+	pub node_name: String,
+
+	/// Configuration for the transport layer.
+	pub transport: TransportConfig,
+
+	/// Maximum number of peers to ask the same blocks in parallel.
+	pub max_parallel_downloads: u32,
+
+	/// Initial syncing mode.
+	pub sync_mode: SyncMode,
+
+	/// True if Kademlia random discovery should be enabled.
+	///
+	/// If true, the node will automatically randomly walk the DHT in order to find new peers.
+	pub enable_dht_random_walk: bool,
+
+	/// Should we insert non-global addresses into the DHT?
+	pub allow_non_globals_in_dht: bool,
+
+	/// Require iterative Kademlia DHT queries to use disjoint paths for increased resiliency in
+	/// the presence of potentially adversarial nodes.
+	pub kademlia_disjoint_query_paths: bool,
+
+	/// Enable serving block data over IPFS bitswap.
+	pub ipfs_server: bool,
+
+	/// Size of Yamux receive window of all substreams. `None` for the default (256kiB).
+	/// Any value less than 256kiB is invalid.
+	///
+	/// # Context
+	///
+	/// By design, notifications substreams on top of Yamux connections only allow up to `N` bytes
+	/// to be transferred at a time, where `N` is the Yamux receive window size configurable here.
+	/// This means, in practice, that every `N` bytes must be acknowledged by the receiver before
+	/// the sender can send more data. The maximum bandwidth of each notifications substream is
+	/// therefore `N / round_trip_time`.
+	///
+	/// It is recommended to leave this to `None`, and use a request-response protocol instead if
+	/// a large amount of data must be transferred. The reason why the value is configurable is
+	/// that some Substrate users mis-use notification protocols to send large amounts of data.
+	/// As such, this option isn't designed to stay and will likely get removed in the future.
+	///
+	/// Note that configuring a value here isn't a modification of the Yamux protocol, but rather
+	/// a modification of the way the implementation works. Different nodes with different
+	/// configured values remain compatible with each other.
+	pub yamux_window_size: Option<u32>,
+}
+
+impl NetworkConfiguration {
+	/// Create new default configuration
+	pub fn new<SN: Into<String>, SV: Into<String>>(
+		node_name: SN,
+		client_version: SV,
+		node_key: NodeKeyConfig,
+		net_config_path: Option<PathBuf>,
+	) -> Self {
+		let default_peers_set = SetConfig::default();
+		Self {
+			net_config_path,
+			listen_addresses: Vec::new(),
+			public_addresses: Vec::new(),
+			boot_nodes: Vec::new(),
+			node_key,
+			request_response_protocols: Vec::new(),
+			default_peers_set_num_full: default_peers_set.in_peers + default_peers_set.out_peers,
+			default_peers_set,
+			extra_sets: Vec::new(),
+			client_version: client_version.into(),
+			node_name: node_name.into(),
+			transport: TransportConfig::Normal { enable_mdns: false, allow_private_ip: true },
+			max_parallel_downloads: 5,
+			sync_mode: SyncMode::Full,
+			enable_dht_random_walk: true,
+			allow_non_globals_in_dht: false,
+			kademlia_disjoint_query_paths: false,
+			yamux_window_size: None,
+			ipfs_server: false,
+		}
+	}
+
+	/// Create new default configuration for localhost-only connection with random port (useful for
+	/// testing)
+	pub fn new_local() -> NetworkConfiguration {
+		let mut config =
+			NetworkConfiguration::new("test-node", "test-client", Default::default(), None);
+
+		config.listen_addresses =
+			vec![iter::once(multiaddr::Protocol::Ip4(Ipv4Addr::new(127, 0, 0, 1)))
+				.chain(iter::once(multiaddr::Protocol::Tcp(0)))
+				.collect()];
+
+		config.allow_non_globals_in_dht = true;
+		config
+	}
+
+	/// Create new default configuration for localhost-only connection with random port (useful for
+	/// testing)
+	pub fn new_memory() -> NetworkConfiguration {
+		let mut config =
+			NetworkConfiguration::new("test-node", "test-client", Default::default(), None);
+
+		config.listen_addresses =
+			vec![iter::once(multiaddr::Protocol::Ip4(Ipv4Addr::new(127, 0, 0, 1)))
+				.chain(iter::once(multiaddr::Protocol::Tcp(0)))
+				.collect()];
+
+		config.allow_non_globals_in_dht = true;
+		config
+	}
+}
 
 /// Network initialization parameters.
 pub struct Params<Client> {
@@ -67,3 +717,43 @@ pub struct Params<Client> {
 	/// Request response protocol configurations
 	pub request_response_protocol_configs: Vec<RequestResponseConfig>,
 }
+
+#[cfg(test)]
+mod tests {
+	use super::*;
+	use tempfile::TempDir;
+
+	fn tempdir_with_prefix(prefix: &str) -> TempDir {
+		tempfile::Builder::new().prefix(prefix).tempdir().unwrap()
+	}
+
+	fn secret_bytes(kp: &Keypair) -> Vec<u8> {
+		let Keypair::Ed25519(p) = kp;
+		p.secret().as_ref().iter().cloned().collect()
+	}
+
+	#[test]
+	fn test_secret_file() {
+		let tmp = tempdir_with_prefix("x");
+		std::fs::remove_dir(tmp.path()).unwrap(); // should be recreated
+		let file = tmp.path().join("x").to_path_buf();
+		let kp1 = NodeKeyConfig::Ed25519(Secret::File(file.clone())).into_keypair().unwrap();
+		let kp2 = NodeKeyConfig::Ed25519(Secret::File(file.clone())).into_keypair().unwrap();
+		assert!(file.is_file() && secret_bytes(&kp1) == secret_bytes(&kp2))
+	}
+
+	#[test]
+	fn test_secret_input() {
+		let sk = ed25519::SecretKey::generate();
+		let kp1 = NodeKeyConfig::Ed25519(Secret::Input(sk.clone())).into_keypair().unwrap();
+		let kp2 = NodeKeyConfig::Ed25519(Secret::Input(sk)).into_keypair().unwrap();
+		assert!(secret_bytes(&kp1) == secret_bytes(&kp2));
+	}
+
+	#[test]
+	fn test_secret_new() {
+		let kp1 = NodeKeyConfig::Ed25519(Secret::New).into_keypair().unwrap();
+		let kp2 = NodeKeyConfig::Ed25519(Secret::New).into_keypair().unwrap();
+		assert!(secret_bytes(&kp1) != secret_bytes(&kp2));
+	}
+}
diff --git a/substrate/client/network/src/discovery.rs b/substrate/client/network/src/discovery.rs
index 6a8c777cac9c632f1ff21a2b0d2ce7993a0019e6..7100c0c70d5258499cf8bbf0e357eafb6a268359 100644
--- a/substrate/client/network/src/discovery.rs
+++ b/substrate/client/network/src/discovery.rs
@@ -46,6 +46,8 @@
 //! active mechanism that asks nodes for the addresses they are listening on. Whenever we learn
 //! of a node's address, you must call `add_self_reported_address`.
 
+use crate::{config::ProtocolId, utils::LruHashSet};
+
 use array_bytes::bytes2hex;
 use futures::prelude::*;
 use futures_timer::Delay;
@@ -73,7 +75,6 @@ use libp2p::{
 	},
 };
 use log::{debug, info, trace, warn};
-use sc_network_common::{config::ProtocolId, utils::LruHashSet};
 use sp_core::hexdisplay::HexDisplay;
 use std::{
 	cmp,
@@ -904,6 +905,7 @@ mod tests {
 	use super::{
 		kademlia_protocol_name, legacy_kademlia_protocol_name, DiscoveryConfig, DiscoveryOut,
 	};
+	use crate::config::ProtocolId;
 	use futures::prelude::*;
 	use libp2p::{
 		core::{
@@ -915,7 +917,6 @@ mod tests {
 		swarm::{Executor, Swarm, SwarmEvent},
 		yamux, Multiaddr,
 	};
-	use sc_network_common::config::ProtocolId;
 	use sp_core::hash::H256;
 	use std::{collections::HashSet, pin::Pin, task::Poll};
 
diff --git a/substrate/client/network/common/src/error.rs b/substrate/client/network/src/error.rs
similarity index 97%
rename from substrate/client/network/common/src/error.rs
rename to substrate/client/network/src/error.rs
index 712b8c5de3f66f48bb1786670906ca689f326d9a..f0828fb821f3504b63669ebfd663cc703388a437 100644
--- a/substrate/client/network/common/src/error.rs
+++ b/substrate/client/network/src/error.rs
@@ -18,7 +18,8 @@
 
 //! Substrate network possible errors.
 
-use crate::{config::TransportConfig, protocol::ProtocolName};
+use crate::{config::TransportConfig, types::ProtocolName};
+
 use libp2p::{Multiaddr, PeerId};
 
 use std::fmt;
diff --git a/substrate/client/network/common/src/protocol/event.rs b/substrate/client/network/src/event.rs
similarity index 97%
rename from substrate/client/network/common/src/protocol/event.rs
rename to substrate/client/network/src/event.rs
index 90c38b48c320f988609fac193b9d9930faa701a5..3ecd8f931142904da95b5123bb3be88139ef9a36 100644
--- a/substrate/client/network/common/src/protocol/event.rs
+++ b/substrate/client/network/src/event.rs
@@ -19,11 +19,13 @@
 //! Network event types. These are are not the part of the protocol, but rather
 //! events that happen on the network like DHT get/put results received.
 
-use super::ProtocolName;
-use crate::protocol::role::ObservedRole;
+use crate::types::ProtocolName;
+
 use bytes::Bytes;
 use libp2p::{core::PeerId, kad::record::Key};
 
+use sc_network_common::role::ObservedRole;
+
 /// Events generated by DHT as a response to get_value and put_value requests.
 #[derive(Debug, Clone)]
 #[must_use]
diff --git a/substrate/client/network/src/lib.rs b/substrate/client/network/src/lib.rs
index f94a71681cd3db74a594187a8633ad4fc48175ec..c290f4b94db533b98b3db057074e79784ee09a2d 100644
--- a/substrate/client/network/src/lib.rs
+++ b/substrate/client/network/src/lib.rs
@@ -248,36 +248,40 @@ mod behaviour;
 mod discovery;
 mod peer_info;
 mod protocol;
-mod request_responses;
 mod service;
 mod transport;
 
 pub mod config;
+pub mod error;
+pub mod event;
 pub mod network_state;
+pub mod request_responses;
+pub mod types;
+pub mod utils;
 
+pub use event::{DhtEvent, Event};
 #[doc(inline)]
 pub use libp2p::{multiaddr, Multiaddr, PeerId};
+pub use request_responses::{IfDisconnected, RequestFailure, RequestResponseConfig};
 pub use sc_network_common::{
-	protocol::{
-		event::{DhtEvent, Event},
-		role::ObservedRole,
-		ProtocolName,
-	},
-	request_responses::{IfDisconnected, RequestFailure},
-	service::{
-		KademliaKey, NetworkBlock, NetworkDHTProvider, NetworkRequest, NetworkSigner,
-		NetworkStateInfo, NetworkStatus, NetworkStatusProvider, NetworkSyncForkRequest, Signature,
-		SigningError,
-	},
+	role::ObservedRole,
 	sync::{
 		warp::{WarpSyncPhase, WarpSyncProgress},
 		ExtendedPeerInfo, StateDownloadProgress, SyncEventStream, SyncState, SyncStatusProvider,
 	},
 };
 pub use service::{
-	DecodingError, Keypair, NetworkService, NetworkWorker, NotificationSender,
-	NotificationSenderReady, OutboundFailure, PublicKey,
+	signature::Signature,
+	traits::{
+		KademliaKey, NetworkBlock, NetworkDHTProvider, NetworkEventStream, NetworkNotification,
+		NetworkPeers, NetworkRequest, NetworkSigner, NetworkStateInfo, NetworkStatus,
+		NetworkStatusProvider, NetworkSyncForkRequest, NotificationSender as NotificationSenderT,
+		NotificationSenderError, NotificationSenderReady,
+	},
+	DecodingError, Keypair, NetworkService, NetworkWorker, NotificationSender, OutboundFailure,
+	PublicKey,
 };
+pub use types::ProtocolName;
 
 pub use sc_peerset::ReputationChange;
 
diff --git a/substrate/client/network/src/peer_info.rs b/substrate/client/network/src/peer_info.rs
index 1cf0c928a40672cf7e8bb87c83fcf28ce65df023..3f769736ff10e1106b18c0d027303585992a36ce 100644
--- a/substrate/client/network/src/peer_info.rs
+++ b/substrate/client/network/src/peer_info.rs
@@ -16,6 +16,8 @@
 // You should have received a copy of the GNU General Public License
 // along with this program. If not, see <https://www.gnu.org/licenses/>.
 
+use crate::utils::interval;
+
 use fnv::FnvHashMap;
 use futures::prelude::*;
 use libp2p::{
@@ -36,8 +38,8 @@ use libp2p::{
 	Multiaddr,
 };
 use log::{debug, error, trace};
-use sc_network_common::utils::interval;
 use smallvec::SmallVec;
+
 use std::{
 	collections::hash_map::Entry,
 	pin::Pin,
diff --git a/substrate/client/network/src/protocol.rs b/substrate/client/network/src/protocol.rs
index 8d604124233a0c97cc8998b926f3326f0784183a..06ca02c0ca8d58c58ef2e570bc802a71ae954649 100644
--- a/substrate/client/network/src/protocol.rs
+++ b/substrate/client/network/src/protocol.rs
@@ -16,7 +16,11 @@
 // You should have received a copy of the GNU General Public License
 // along with this program. If not, see <https://www.gnu.org/licenses/>.
 
-use crate::config;
+use crate::{
+	config::{self, NonReservedPeerMode},
+	error,
+	types::ProtocolName,
+};
 
 use bytes::Bytes;
 use codec::{DecodeAll, Encode};
@@ -29,27 +33,25 @@ use libp2p::{
 	Multiaddr, PeerId,
 };
 use log::{debug, error, warn};
-use message::{generic::Message as GenericMessage, Message};
-use notifications::{Notifications, NotificationsOut};
-use sc_network_common::{
-	config::NonReservedPeerMode,
-	error,
-	protocol::{role::Roles, ProtocolName},
-	sync::message::BlockAnnouncesHandshake,
-};
+
+use sc_network_common::{role::Roles, sync::message::BlockAnnouncesHandshake};
 use sp_runtime::traits::Block as BlockT;
+
 use std::{
 	collections::{HashMap, HashSet, VecDeque},
 	iter,
 	task::Poll,
 };
 
+use message::{generic::Message as GenericMessage, Message};
+use notifications::{Notifications, NotificationsOut};
+
+pub use notifications::{NotificationsSink, NotifsHandlerError, Ready};
+
 mod notifications;
 
 pub mod message;
 
-pub use notifications::{NotificationsSink, NotifsHandlerError, Ready};
-
 /// Maximum size used for notifications in the block announce and transaction protocols.
 // Must be equal to `max(MAX_BLOCK_ANNOUNCE_SIZE, MAX_TRANSACTIONS_SIZE)`.
 pub(crate) const BLOCK_ANNOUNCES_TRANSACTIONS_SUBSTREAM_SIZE: u64 = 16 * 1024 * 1024;
@@ -93,7 +95,7 @@ impl<B: BlockT> Protocol<B> {
 	pub fn new(
 		roles: Roles,
 		network_config: &config::NetworkConfiguration,
-		block_announces_protocol: sc_network_common::config::NonDefaultSetConfig,
+		block_announces_protocol: config::NonDefaultSetConfig,
 	) -> error::Result<(Self, sc_peerset::PeersetHandle, Vec<(PeerId, Multiaddr)>)> {
 		let mut known_addresses = Vec::new();
 
diff --git a/substrate/client/network/src/protocol/message.rs b/substrate/client/network/src/protocol/message.rs
index f7981f17149515bd65bf472258c4e942fedc9810..66dca2975375f9886b6f15513c2debf09883db03 100644
--- a/substrate/client/network/src/protocol/message.rs
+++ b/substrate/client/network/src/protocol/message.rs
@@ -61,7 +61,7 @@ pub mod generic {
 	use sc_client_api::StorageProof;
 	use sc_network_common::{
 		message::RequestId,
-		protocol::role::Roles,
+		role::Roles,
 		sync::message::{
 			generic::{BlockRequest, BlockResponse},
 			BlockAnnounce,
diff --git a/substrate/client/network/src/protocol/notifications/behaviour.rs b/substrate/client/network/src/protocol/notifications/behaviour.rs
index 093d5846db7de8258ed760fd98cab1bccdc4ce15..74e27fa17c602f86b8f4e85c4158f3cb747ebb0a 100644
--- a/substrate/client/network/src/protocol/notifications/behaviour.rs
+++ b/substrate/client/network/src/protocol/notifications/behaviour.rs
@@ -16,8 +16,11 @@
 // You should have received a copy of the GNU General Public License
 // along with this program. If not, see <https://www.gnu.org/licenses/>.
 
-use crate::protocol::notifications::handler::{
-	self, NotificationsSink, NotifsHandlerIn, NotifsHandlerOut, NotifsHandlerProto,
+use crate::{
+	protocol::notifications::handler::{
+		self, NotificationsSink, NotifsHandlerIn, NotifsHandlerOut, NotifsHandlerProto,
+	},
+	types::ProtocolName,
 };
 
 use bytes::BytesMut;
@@ -35,7 +38,6 @@ use libp2p::{
 use log::{error, trace, warn};
 use parking_lot::RwLock;
 use rand::distributions::{Distribution as _, Uniform};
-use sc_network_common::protocol::ProtocolName;
 use sc_peerset::DropReason;
 use smallvec::SmallVec;
 use std::{
diff --git a/substrate/client/network/src/protocol/notifications/handler.rs b/substrate/client/network/src/protocol/notifications/handler.rs
index 70157386ef32e683790bd8e0c569bb4428f50afd..9d8d98fd8cf27d4cfe7f187f97ef01b7cea5207e 100644
--- a/substrate/client/network/src/protocol/notifications/handler.rs
+++ b/substrate/client/network/src/protocol/notifications/handler.rs
@@ -57,9 +57,12 @@
 //! It is illegal to send a [`NotifsHandlerIn::Open`] before a previously-emitted
 //! [`NotifsHandlerIn::Open`] has gotten an answer.
 
-use crate::protocol::notifications::upgrade::{
-	NotificationsIn, NotificationsInSubstream, NotificationsOut, NotificationsOutSubstream,
-	UpgradeCollec,
+use crate::{
+	protocol::notifications::upgrade::{
+		NotificationsIn, NotificationsInSubstream, NotificationsOut, NotificationsOutSubstream,
+		UpgradeCollec,
+	},
+	types::ProtocolName,
 };
 
 use bytes::BytesMut;
@@ -77,7 +80,6 @@ use libp2p::{
 };
 use log::error;
 use parking_lot::{Mutex, RwLock};
-use sc_network_common::protocol::ProtocolName;
 use std::{
 	collections::VecDeque,
 	mem,
@@ -945,8 +947,9 @@ pub mod tests {
 				Poll::Ready(Some(NotificationsSinkMessage::Notification { message })) =>
 					Poll::Ready(Some(message)),
 				Poll::Pending => Poll::Ready(None),
-				Poll::Ready(Some(NotificationsSinkMessage::ForceClose)) | Poll::Ready(None) =>
-					panic!("sink closed"),
+				Poll::Ready(Some(NotificationsSinkMessage::ForceClose)) | Poll::Ready(None) => {
+					panic!("sink closed")
+				},
 			})
 			.await
 		}
diff --git a/substrate/client/network/src/protocol/notifications/upgrade/collec.rs b/substrate/client/network/src/protocol/notifications/upgrade/collec.rs
index 89999ff0c7534f4e2953363a485d9240e95a3c76..791821b3f75dab135a34f7478b4c1c808566890e 100644
--- a/substrate/client/network/src/protocol/notifications/upgrade/collec.rs
+++ b/substrate/client/network/src/protocol/notifications/upgrade/collec.rs
@@ -103,8 +103,8 @@ impl<T: Future<Output = Result<O, E>>, O, E> Future for FutWithUsize<T> {
 #[cfg(test)]
 mod tests {
 	use super::*;
+	use crate::types::ProtocolName as ProtoName;
 	use libp2p::core::upgrade::{ProtocolName, UpgradeInfo};
-	use sc_network_common::protocol::ProtocolName as ProtoName;
 
 	// TODO: move to mocks
 	mockall::mock! {
diff --git a/substrate/client/network/src/protocol/notifications/upgrade/notifications.rs b/substrate/client/network/src/protocol/notifications/upgrade/notifications.rs
index bfdd9ccfa7eb97e0822e4257165e8a751721c941..4e1c033f33b68e551fbd98e9c06edcbdd7173b5c 100644
--- a/substrate/client/network/src/protocol/notifications/upgrade/notifications.rs
+++ b/substrate/client/network/src/protocol/notifications/upgrade/notifications.rs
@@ -16,7 +16,6 @@
 // You should have received a copy of the GNU General Public License
 // along with this program. If not, see <https://www.gnu.org/licenses/>.
 
-use asynchronous_codec::Framed;
 /// Notifications protocol.
 ///
 /// The Substrate notifications protocol consists in the following:
@@ -35,11 +34,15 @@ use asynchronous_codec::Framed;
 ///
 /// Notification substreams are unidirectional. If A opens a substream with B, then B is
 /// encouraged but not required to open a substream to A as well.
+use crate::types::ProtocolName;
+
+use asynchronous_codec::Framed;
 use bytes::BytesMut;
 use futures::prelude::*;
 use libp2p::core::{upgrade, InboundUpgrade, OutboundUpgrade, UpgradeInfo};
 use log::{error, warn};
-use sc_network_common::protocol::ProtocolName;
+use unsigned_varint::codec::UviBytes;
+
 use std::{
 	convert::Infallible,
 	io, mem,
@@ -47,7 +50,6 @@ use std::{
 	task::{Context, Poll},
 	vec,
 };
-use unsigned_varint::codec::UviBytes;
 
 /// Maximum allowed size of the two handshake messages, in bytes.
 const MAX_HANDSHAKE_SIZE: usize = 1024;
diff --git a/substrate/client/network/src/request_responses.rs b/substrate/client/network/src/request_responses.rs
index 37c97e8282b4ce879ca931489dd9f2fa951d7ce6..4628b0191a2e8b02330b14e3f6b47766f20d9fa9 100644
--- a/substrate/client/network/src/request_responses.rs
+++ b/substrate/client/network/src/request_responses.rs
@@ -34,7 +34,8 @@
 //! - If provided, a ["requests processing"](ProtocolConfig::inbound_queue) channel
 //! is used to handle incoming requests.
 
-use crate::ReputationChange;
+use crate::{types::ProtocolName, ReputationChange};
+
 use futures::{
 	channel::{mpsc, oneshot},
 	prelude::*,
@@ -43,7 +44,7 @@ use libp2p::{
 	core::{connection::ConnectionId, Multiaddr, PeerId},
 	request_response::{
 		handler::RequestResponseHandler, ProtocolSupport, RequestResponse, RequestResponseCodec,
-		RequestResponseConfig, RequestResponseEvent, RequestResponseMessage, ResponseChannel,
+		RequestResponseEvent, RequestResponseMessage, ResponseChannel,
 	},
 	swarm::{
 		behaviour::{ConnectionClosed, DialFailure, FromSwarm, ListenFailure},
@@ -52,12 +53,9 @@ use libp2p::{
 		PollParameters,
 	},
 };
-use sc_network_common::{
-	protocol::ProtocolName,
-	request_responses::{
-		IfDisconnected, IncomingRequest, OutgoingResponse, ProtocolConfig, RequestFailure,
-	},
-};
+
+use sc_peerset::{PeersetHandle, BANNED_THRESHOLD};
+
 use std::{
 	collections::{hash_map::Entry, HashMap},
 	io, iter,
@@ -66,8 +64,138 @@ use std::{
 	time::{Duration, Instant},
 };
 
-pub use libp2p::request_response::{InboundFailure, OutboundFailure, RequestId};
-use sc_peerset::{PeersetHandle, BANNED_THRESHOLD};
+pub use libp2p::request_response::{
+	InboundFailure, OutboundFailure, RequestId, RequestResponseConfig,
+};
+
+/// Error in a request.
+#[derive(Debug, thiserror::Error)]
+#[allow(missing_docs)]
+pub enum RequestFailure {
+	#[error("We are not currently connected to the requested peer.")]
+	NotConnected,
+	#[error("Given protocol hasn't been registered.")]
+	UnknownProtocol,
+	#[error("Remote has closed the substream before answering, thereby signaling that it considers the request as valid, but refused to answer it.")]
+	Refused,
+	#[error("The remote replied, but the local node is no longer interested in the response.")]
+	Obsolete,
+	#[error("Problem on the network: {0}")]
+	Network(OutboundFailure),
+}
+
+/// Configuration for a single request-response protocol.
+#[derive(Debug, Clone)]
+pub struct ProtocolConfig {
+	/// Name of the protocol on the wire. Should be something like `/foo/bar`.
+	pub name: ProtocolName,
+
+	/// Fallback on the wire protocol names to support.
+	pub fallback_names: Vec<ProtocolName>,
+
+	/// Maximum allowed size, in bytes, of a request.
+	///
+	/// Any request larger than this value will be declined as a way to avoid allocating too
+	/// much memory for it.
+	pub max_request_size: u64,
+
+	/// Maximum allowed size, in bytes, of a response.
+	///
+	/// Any response larger than this value will be declined as a way to avoid allocating too
+	/// much memory for it.
+	pub max_response_size: u64,
+
+	/// Duration after which emitted requests are considered timed out.
+	///
+	/// If you expect the response to come back quickly, you should set this to a smaller duration.
+	pub request_timeout: Duration,
+
+	/// Channel on which the networking service will send incoming requests.
+	///
+	/// Every time a peer sends a request to the local node using this protocol, the networking
+	/// service will push an element on this channel. The receiving side of this channel then has
+	/// to pull this element, process the request, and send back the response to send back to the
+	/// peer.
+	///
+	/// The size of the channel has to be carefully chosen. If the channel is full, the networking
+	/// service will discard the incoming request send back an error to the peer. Consequently,
+	/// the channel being full is an indicator that the node is overloaded.
+	///
+	/// You can typically set the size of the channel to `T / d`, where `T` is the
+	/// `request_timeout` and `d` is the expected average duration of CPU and I/O it takes to
+	/// build a response.
+	///
+	/// Can be `None` if the local node does not support answering incoming requests.
+	/// If this is `None`, then the local node will not advertise support for this protocol towards
+	/// other peers. If this is `Some` but the channel is closed, then the local node will
+	/// advertise support for this protocol, but any incoming request will lead to an error being
+	/// sent back.
+	pub inbound_queue: Option<mpsc::Sender<IncomingRequest>>,
+}
+
+/// A single request received by a peer on a request-response protocol.
+#[derive(Debug)]
+pub struct IncomingRequest {
+	/// Who sent the request.
+	pub peer: PeerId,
+
+	/// Request sent by the remote. Will always be smaller than
+	/// [`ProtocolConfig::max_request_size`].
+	pub payload: Vec<u8>,
+
+	/// Channel to send back the response.
+	///
+	/// There are two ways to indicate that handling the request failed:
+	///
+	/// 1. Drop `pending_response` and thus not changing the reputation of the peer.
+	///
+	/// 2. Sending an `Err(())` via `pending_response`, optionally including reputation changes for
+	/// the given peer.
+	pub pending_response: oneshot::Sender<OutgoingResponse>,
+}
+
+/// Response for an incoming request to be send by a request protocol handler.
+#[derive(Debug)]
+pub struct OutgoingResponse {
+	/// The payload of the response.
+	///
+	/// `Err(())` if none is available e.g. due an error while handling the request.
+	pub result: Result<Vec<u8>, ()>,
+
+	/// Reputation changes accrued while handling the request. To be applied to the reputation of
+	/// the peer sending the request.
+	pub reputation_changes: Vec<ReputationChange>,
+
+	/// If provided, the `oneshot::Sender` will be notified when the request has been sent to the
+	/// peer.
+	///
+	/// > **Note**: Operating systems typically maintain a buffer of a few dozen kilobytes of
+	/// >			outgoing data for each TCP socket, and it is not possible for a user
+	/// >			application to inspect this buffer. This channel here is not actually notified
+	/// >			when the response has been fully sent out, but rather when it has fully been
+	/// >			written to the buffer managed by the operating system.
+	pub sent_feedback: Option<oneshot::Sender<()>>,
+}
+
+/// When sending a request, what to do on a disconnected recipient.
+#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
+pub enum IfDisconnected {
+	/// Try to connect to the peer.
+	TryConnect,
+	/// Just fail if the destination is not yet connected.
+	ImmediateError,
+}
+
+/// Convenience functions for `IfDisconnected`.
+impl IfDisconnected {
+	/// Shall we connect to a disconnected peer?
+	pub fn should_connect(self) -> bool {
+		match self {
+			Self::TryConnect => true,
+			Self::ImmediateError => false,
+		}
+	}
+}
 
 /// Event generated by the [`RequestResponsesBehaviour`].
 #[derive(Debug)]
@@ -103,7 +231,12 @@ pub enum Event {
 	},
 
 	/// A request protocol handler issued reputation changes for the given peer.
-	ReputationChanges { peer: PeerId, changes: Vec<ReputationChange> },
+	ReputationChanges {
+		/// Peer whose reputation needs to be adjust.
+		peer: PeerId,
+		/// Reputation changes.
+		changes: Vec<ReputationChange>,
+	},
 }
 
 /// Combination of a protocol name and a request id.
@@ -344,7 +477,7 @@ impl NetworkBehaviour for RequestResponsesBehaviour {
 						)
 					}
 				},
-			FromSwarm::DialFailure(DialFailure { peer_id, error, handler }) =>
+			FromSwarm::DialFailure(DialFailure { peer_id, error, handler }) => {
 				for (p_name, p_handler) in handler.into_iter() {
 					if let Some((proto, _)) = self.protocols.get_mut(p_name.as_str()) {
 						proto.on_swarm_event(FromSwarm::DialFailure(DialFailure {
@@ -359,7 +492,8 @@ impl NetworkBehaviour for RequestResponsesBehaviour {
 						  p_name,
 						)
 					}
-				},
+				}
+			},
 			FromSwarm::ListenerClosed(e) =>
 				for (p, _) in self.protocols.values_mut() {
 					NetworkBehaviour::on_swarm_event(p, FromSwarm::ListenerClosed(e));
diff --git a/substrate/client/network/src/service.rs b/substrate/client/network/src/service.rs
index 4a05393618cfb26b51a065f14d287794f51121f0..6dc00b36ceb53f34674f64dc775deb7138fc510a 100644
--- a/substrate/client/network/src/service.rs
+++ b/substrate/client/network/src/service.rs
@@ -29,13 +29,27 @@
 
 use crate::{
 	behaviour::{self, Behaviour, BehaviourOut},
-	config::Params,
+	config::{MultiaddrWithPeerId, Params, TransportConfig},
 	discovery::DiscoveryConfig,
+	error::Error,
+	event::{DhtEvent, Event},
 	network_state::{
 		NetworkState, NotConnectedPeer as NetworkStateNotConnectedPeer, Peer as NetworkStatePeer,
 	},
 	protocol::{self, NotificationsSink, NotifsHandlerError, Protocol, Ready},
-	transport, ReputationChange,
+	request_responses::{IfDisconnected, RequestFailure},
+	service::{
+		signature::{Signature, SigningError},
+		traits::{
+			NetworkDHTProvider, NetworkEventStream, NetworkNotification, NetworkPeers,
+			NetworkRequest, NetworkSigner, NetworkStateInfo, NetworkStatus, NetworkStatusProvider,
+			NotificationSender as NotificationSenderT, NotificationSenderError,
+			NotificationSenderReady as NotificationSenderReadyT,
+		},
+	},
+	transport,
+	types::ProtocolName,
+	ReputationChange,
 };
 
 use futures::{channel::oneshot, prelude::*};
@@ -55,26 +69,13 @@ use libp2p::{
 use log::{debug, error, info, trace, warn};
 use metrics::{Histogram, HistogramVec, MetricSources, Metrics};
 use parking_lot::Mutex;
-use sc_network_common::{
-	config::{MultiaddrWithPeerId, TransportConfig},
-	error::Error,
-	protocol::{
-		event::{DhtEvent, Event},
-		ProtocolName,
-	},
-	request_responses::{IfDisconnected, RequestFailure},
-	service::{
-		NetworkDHTProvider, NetworkEventStream, NetworkNotification, NetworkPeers, NetworkSigner,
-		NetworkStateInfo, NetworkStatus, NetworkStatusProvider,
-		NotificationSender as NotificationSenderT, NotificationSenderError,
-		NotificationSenderReady as NotificationSenderReadyT, Signature, SigningError,
-	},
-	ExHashT,
-};
+
+use sc_network_common::ExHashT;
 use sc_peerset::PeersetHandle;
 use sc_utils::mpsc::{tracing_unbounded, TracingUnboundedReceiver, TracingUnboundedSender};
 use sp_blockchain::HeaderBackend;
 use sp_runtime::traits::{Block as BlockT, Zero};
+
 use std::{
 	cmp,
 	collections::{HashMap, HashSet},
@@ -90,14 +91,13 @@ use std::{
 };
 
 pub use behaviour::{InboundFailure, OutboundFailure, ResponseFailure};
+pub use libp2p::identity::{error::DecodingError, Keypair, PublicKey};
 
 mod metrics;
 mod out_events;
-#[cfg(test)]
-mod tests;
 
-pub use libp2p::identity::{error::DecodingError, Keypair, PublicKey};
-use sc_network_common::service::NetworkRequest;
+pub mod signature;
+pub mod traits;
 
 /// Custom error that can be produced by the [`ConnectionHandler`] of the [`NetworkBehaviour`].
 /// Used as a template parameter of [`SwarmEvent`] below.
@@ -1432,10 +1432,11 @@ where
 						},
 					}
 				},
-			SwarmEvent::Behaviour(BehaviourOut::ReputationChanges { peer, changes }) =>
+			SwarmEvent::Behaviour(BehaviourOut::ReputationChanges { peer, changes }) => {
 				for change in changes {
 					self.network_service.behaviour().user_protocol().report_peer(peer, change);
-				},
+				}
+			},
 			SwarmEvent::Behaviour(BehaviourOut::PeerIdentify {
 				peer_id,
 				info:
@@ -1467,10 +1468,11 @@ where
 					.user_protocol_mut()
 					.add_default_set_discovered_nodes(iter::once(peer_id));
 			},
-			SwarmEvent::Behaviour(BehaviourOut::RandomKademliaStarted) =>
+			SwarmEvent::Behaviour(BehaviourOut::RandomKademliaStarted) => {
 				if let Some(metrics) = self.metrics.as_ref() {
 					metrics.kademlia_random_queries_total.inc();
-				},
+				}
+			},
 			SwarmEvent::Behaviour(BehaviourOut::NotificationStreamOpened {
 				remote,
 				protocol,
diff --git a/substrate/client/network/src/service/out_events.rs b/substrate/client/network/src/service/out_events.rs
index 3771ea1643aec555936664818cbcc26be233ffb7..398c26793fd4157111169926b9c6f24c8727f8cf 100644
--- a/substrate/client/network/src/service/out_events.rs
+++ b/substrate/client/network/src/service/out_events.rs
@@ -31,11 +31,12 @@
 //! - Send events by calling [`OutChannels::send`]. Events are cloned for each sender in the
 //! collection.
 
+use crate::event::Event;
+
 use futures::{prelude::*, ready, stream::FusedStream};
 use log::error;
 use parking_lot::Mutex;
 use prometheus_endpoint::{register, CounterVec, GaugeVec, Opts, PrometheusError, Registry, U64};
-use sc_network_common::protocol::event::Event;
 use std::{
 	backtrace::Backtrace,
 	cell::RefCell,
diff --git a/substrate/client/network/common/src/service/signature.rs b/substrate/client/network/src/service/signature.rs
similarity index 96%
rename from substrate/client/network/common/src/service/signature.rs
rename to substrate/client/network/src/service/signature.rs
index 14addafc6bba216e133b818fa1d50ffe7b0d9daa..e52dd6b1d2a291df5225671754642f47c75ddb4d 100644
--- a/substrate/client/network/common/src/service/signature.rs
+++ b/substrate/client/network/src/service/signature.rs
@@ -19,10 +19,12 @@
 // If you read this, you are very thorough, congratulations.
 
 use libp2p::{
-	identity::{error::SigningError, Keypair, PublicKey},
+	identity::{Keypair, PublicKey},
 	PeerId,
 };
 
+pub use libp2p::identity::error::SigningError;
+
 /// A result of signing a message with a network identity. Since `PeerId` is potentially a hash of a
 /// `PublicKey`, you need to reveal the `PublicKey` next to the signature, so the verifier can check
 /// if the signature was made by the entity that controls a given `PeerId`.
diff --git a/substrate/client/network/src/service/tests/mod.rs b/substrate/client/network/src/service/tests/mod.rs
deleted file mode 100644
index f29e43e6ce3660db47036a1f000ba3783e4c9af1..0000000000000000000000000000000000000000
--- a/substrate/client/network/src/service/tests/mod.rs
+++ /dev/null
@@ -1,240 +0,0 @@
-// This file is part of Substrate.
-
-// Copyright (C) Parity Technologies (UK) Ltd.
-// SPDX-License-Identifier: GPL-3.0-or-later WITH Classpath-exception-2.0
-
-// This program is free software: you can redistribute it and/or modify
-// it under the terms of the GNU General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-
-// This program is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-// GNU General Public License for more details.
-
-// You should have received a copy of the GNU General Public License
-// along with this program. If not, see <https://www.gnu.org/licenses/>.
-
-use crate::{config, NetworkService, NetworkWorker};
-
-use futures::prelude::*;
-use libp2p::Multiaddr;
-use sc_consensus::{ImportQueue, Link};
-use sc_network_common::{
-	config::{NonDefaultSetConfig, ProtocolId, SetConfig, TransportConfig},
-	protocol::{event::Event, role::Roles},
-	service::NetworkEventStream,
-};
-use sc_network_light::light_client_requests::handler::LightClientRequestHandler;
-use sc_network_sync::{
-	block_request_handler::BlockRequestHandler,
-	engine::SyncingEngine,
-	service::network::{NetworkServiceHandle, NetworkServiceProvider},
-	state_request_handler::StateRequestHandler,
-};
-use sp_runtime::traits::Block as BlockT;
-use std::sync::Arc;
-use substrate_test_runtime_client::{
-	runtime::{Block as TestBlock, Hash as TestHash},
-	TestClientBuilder, TestClientBuilderExt as _,
-};
-
-#[cfg(test)]
-mod service;
-
-type TestNetworkWorker = NetworkWorker<TestBlock, TestHash>;
-type TestNetworkService = NetworkService<TestBlock, TestHash>;
-
-const PROTOCOL_NAME: &str = "/foo";
-
-struct TestNetwork {
-	network: TestNetworkWorker,
-}
-
-impl TestNetwork {
-	pub fn new(network: TestNetworkWorker) -> Self {
-		Self { network }
-	}
-
-	pub fn start_network(
-		self,
-	) -> (Arc<TestNetworkService>, (impl Stream<Item = Event> + std::marker::Unpin)) {
-		let worker = self.network;
-		let service = worker.service().clone();
-		let event_stream = service.event_stream("test");
-
-		tokio::spawn(worker.run());
-
-		(service, event_stream)
-	}
-}
-
-struct TestNetworkBuilder {
-	import_queue: Option<Box<dyn ImportQueue<TestBlock>>>,
-	link: Option<Box<dyn Link<TestBlock>>>,
-	client: Option<Arc<substrate_test_runtime_client::TestClient>>,
-	listen_addresses: Vec<Multiaddr>,
-	set_config: Option<SetConfig>,
-	chain_sync_network: Option<(NetworkServiceProvider, NetworkServiceHandle)>,
-	config: Option<config::NetworkConfiguration>,
-}
-
-impl TestNetworkBuilder {
-	pub fn new() -> Self {
-		Self {
-			import_queue: None,
-			link: None,
-			client: None,
-			listen_addresses: Vec::new(),
-			set_config: None,
-			chain_sync_network: None,
-			config: None,
-		}
-	}
-
-	pub fn with_config(mut self, config: config::NetworkConfiguration) -> Self {
-		self.config = Some(config);
-		self
-	}
-
-	pub fn with_listen_addresses(mut self, addresses: Vec<Multiaddr>) -> Self {
-		self.listen_addresses = addresses;
-		self
-	}
-
-	pub fn with_set_config(mut self, set_config: SetConfig) -> Self {
-		self.set_config = Some(set_config);
-		self
-	}
-
-	pub fn build(mut self) -> TestNetwork {
-		let client = self.client.as_mut().map_or(
-			Arc::new(TestClientBuilder::with_default_backend().build_with_longest_chain().0),
-			|v| v.clone(),
-		);
-
-		let network_config = self.config.unwrap_or(config::NetworkConfiguration {
-			extra_sets: vec![NonDefaultSetConfig {
-				notifications_protocol: PROTOCOL_NAME.into(),
-				fallback_names: Vec::new(),
-				max_notification_size: 1024 * 1024,
-				handshake: None,
-				set_config: self.set_config.unwrap_or_default(),
-			}],
-			listen_addresses: self.listen_addresses,
-			transport: TransportConfig::MemoryOnly,
-			..config::NetworkConfiguration::new_local()
-		});
-
-		#[derive(Clone)]
-		struct PassThroughVerifier(bool);
-
-		#[async_trait::async_trait]
-		impl<B: BlockT> sc_consensus::Verifier<B> for PassThroughVerifier {
-			async fn verify(
-				&mut self,
-				mut block: sc_consensus::BlockImportParams<B, ()>,
-			) -> Result<sc_consensus::BlockImportParams<B, ()>, String> {
-				block.finalized = self.0;
-				block.fork_choice = Some(sc_consensus::ForkChoiceStrategy::LongestChain);
-				Ok(block)
-			}
-		}
-
-		let mut import_queue =
-			self.import_queue.unwrap_or(Box::new(sc_consensus::BasicQueue::new(
-				PassThroughVerifier(false),
-				Box::new(client.clone()),
-				None,
-				&sp_core::testing::TaskExecutor::new(),
-				None,
-			)));
-
-		let protocol_id = ProtocolId::from("test-protocol-name");
-		let fork_id = Some(String::from("test-fork-id"));
-
-		let block_request_protocol_config = {
-			let (handler, protocol_config) =
-				BlockRequestHandler::new(&protocol_id, None, client.clone(), 50);
-			tokio::spawn(handler.run().boxed());
-			protocol_config
-		};
-
-		let state_request_protocol_config = {
-			let (handler, protocol_config) =
-				StateRequestHandler::new(&protocol_id, None, client.clone(), 50);
-			tokio::spawn(handler.run().boxed());
-			protocol_config
-		};
-
-		let light_client_request_protocol_config = {
-			let (handler, protocol_config) =
-				LightClientRequestHandler::new(&protocol_id, None, client.clone());
-			tokio::spawn(handler.run().boxed());
-			protocol_config
-		};
-
-		let (chain_sync_network_provider, chain_sync_network_handle) =
-			self.chain_sync_network.unwrap_or(NetworkServiceProvider::new());
-
-		let (engine, chain_sync_service, block_announce_config) = SyncingEngine::new(
-			Roles::from(&config::Role::Full),
-			client.clone(),
-			None,
-			&network_config,
-			protocol_id.clone(),
-			&None,
-			Box::new(sp_consensus::block_validation::DefaultBlockAnnounceValidator),
-			None,
-			chain_sync_network_handle,
-			import_queue.service(),
-			block_request_protocol_config.name.clone(),
-			state_request_protocol_config.name.clone(),
-			None,
-		)
-		.unwrap();
-		let mut link = self.link.unwrap_or(Box::new(chain_sync_service.clone()));
-		let worker = NetworkWorker::<
-			substrate_test_runtime_client::runtime::Block,
-			substrate_test_runtime_client::runtime::Hash,
-		>::new(config::Params {
-			block_announce_config,
-			role: config::Role::Full,
-			executor: Box::new(|f| {
-				tokio::spawn(f);
-			}),
-			network_config,
-			chain: client.clone(),
-			protocol_id,
-			fork_id,
-			metrics_registry: None,
-			request_response_protocol_configs: [
-				block_request_protocol_config,
-				state_request_protocol_config,
-				light_client_request_protocol_config,
-			]
-			.to_vec(),
-		})
-		.unwrap();
-
-		let service = worker.service().clone();
-		tokio::spawn(async move {
-			let _ = chain_sync_network_provider.run(service).await;
-		});
-		tokio::spawn(async move {
-			loop {
-				futures::future::poll_fn(|cx| {
-					import_queue.poll_actions(cx, &mut *link);
-					std::task::Poll::Ready(())
-				})
-				.await;
-				tokio::time::sleep(std::time::Duration::from_millis(250)).await;
-			}
-		});
-		let stream = worker.service().event_stream("syncing");
-		tokio::spawn(engine.run(stream));
-
-		TestNetwork::new(worker)
-	}
-}
diff --git a/substrate/client/network/common/src/service.rs b/substrate/client/network/src/service/traits.rs
similarity index 99%
rename from substrate/client/network/common/src/service.rs
rename to substrate/client/network/src/service/traits.rs
index d3c5c2f43945021335e84f95dbe720fa87ddfc26..3f9b7e552027bb1f53665b5d52da7f134668df5e 100644
--- a/substrate/client/network/common/src/service.rs
+++ b/substrate/client/network/src/service/traits.rs
@@ -20,17 +20,20 @@
 
 use crate::{
 	config::MultiaddrWithPeerId,
-	protocol::{event::Event, ProtocolName},
+	event::Event,
 	request_responses::{IfDisconnected, RequestFailure},
+	service::signature::Signature,
+	types::ProtocolName,
 };
+
 use futures::{channel::oneshot, Stream};
-pub use libp2p::{identity::error::SigningError, kad::record::Key as KademliaKey};
 use libp2p::{Multiaddr, PeerId};
+
 use sc_peerset::ReputationChange;
-pub use signature::Signature;
+
 use std::{collections::HashSet, future::Future, pin::Pin, sync::Arc};
 
-mod signature;
+pub use libp2p::{identity::error::SigningError, kad::record::Key as KademliaKey};
 
 /// Signer with network identity
 pub trait NetworkSigner {
diff --git a/substrate/client/network/common/src/protocol.rs b/substrate/client/network/src/types.rs
similarity index 99%
rename from substrate/client/network/common/src/protocol.rs
rename to substrate/client/network/src/types.rs
index bfeb1daf5d53b6da48cdef0b0f274b0891f34c3d..b0e32ae109149e2485c62d469c1b14624989ac03 100644
--- a/substrate/client/network/common/src/protocol.rs
+++ b/substrate/client/network/src/types.rs
@@ -16,6 +16,10 @@
 // You should have received a copy of the GNU General Public License
 // along with this program. If not, see <https://www.gnu.org/licenses/>.
 
+//! `sc-network` type definitions
+
+use libp2p::core::upgrade;
+
 use std::{
 	borrow::Borrow,
 	fmt,
@@ -24,11 +28,6 @@ use std::{
 	sync::Arc,
 };
 
-use libp2p::core::upgrade;
-
-pub mod event;
-pub mod role;
-
 /// The protocol name transmitted on the wire.
 #[derive(Debug, Clone)]
 pub enum ProtocolName {
diff --git a/substrate/client/network/common/src/utils.rs b/substrate/client/network/src/utils.rs
similarity index 98%
rename from substrate/client/network/common/src/utils.rs
rename to substrate/client/network/src/utils.rs
index c32d264a943e749788554b6027e162cf48bc6791..8db2cf4e7920d8072f63300f6ebdfcf1889c9e13 100644
--- a/substrate/client/network/common/src/utils.rs
+++ b/substrate/client/network/src/utils.rs
@@ -16,9 +16,12 @@
 // You should have received a copy of the GNU General Public License
 // along with this program. If not, see <https://www.gnu.org/licenses/>.
 
+//! `sc-network` utilities
+
 use futures::{stream::unfold, FutureExt, Stream, StreamExt};
 use futures_timer::Delay;
 use linked_hash_set::LinkedHashSet;
+
 use std::{hash::Hash, num::NonZeroUsize, time::Duration};
 
 /// Creates a stream that returns a new value every `duration`.
diff --git a/substrate/client/network/sync/Cargo.toml b/substrate/client/network/sync/Cargo.toml
index 52ab0d15e167038428a96bec263696db23f4afd5..298cbf1801f2e594171c721c59e652ec7a6bae67 100644
--- a/substrate/client/network/sync/Cargo.toml
+++ b/substrate/client/network/sync/Cargo.toml
@@ -32,6 +32,7 @@ fork-tree = { version = "3.0.0", path = "../../../utils/fork-tree" }
 prometheus-endpoint = { package = "substrate-prometheus-endpoint", version = "0.10.0-dev", path = "../../../utils/prometheus" }
 sc-client-api = { version = "4.0.0-dev", path = "../../api" }
 sc-consensus = { version = "0.10.0-dev", path = "../../consensus/common" }
+sc-network = { version = "0.10.0-dev", path = "../" }
 sc-network-common = { version = "0.10.0-dev", path = "../common" }
 sc-peerset = { version = "4.0.0-dev", path = "../../peerset" }
 sc-utils = { version = "4.0.0-dev", path = "../../utils" }
diff --git a/substrate/client/network/sync/src/block_request_handler.rs b/substrate/client/network/sync/src/block_request_handler.rs
index 38aca2cde3fd2b2efe221dc925def71a518139a6..921efd7def62298aface451c543629874df205b8 100644
--- a/substrate/client/network/sync/src/block_request_handler.rs
+++ b/substrate/client/network/sync/src/block_request_handler.rs
@@ -18,6 +18,7 @@
 //! `crate::request_responses::RequestResponsesBehaviour`.
 
 use crate::schema::v1::{block_request::FromBlock, BlockResponse, Direction};
+
 use codec::{Decode, Encode};
 use futures::{
 	channel::{mpsc, oneshot},
@@ -27,17 +28,19 @@ use libp2p::PeerId;
 use log::debug;
 use lru::LruCache;
 use prost::Message;
+
 use sc_client_api::BlockBackend;
-use sc_network_common::{
+use sc_network::{
 	config::ProtocolId,
 	request_responses::{IncomingRequest, OutgoingResponse, ProtocolConfig},
-	sync::message::BlockAttributes,
 };
+use sc_network_common::sync::message::BlockAttributes;
 use sp_blockchain::HeaderBackend;
 use sp_runtime::{
 	generic::BlockId,
 	traits::{Block as BlockT, Header, One, Zero},
 };
+
 use std::{
 	cmp::min,
 	hash::{Hash, Hasher},
diff --git a/substrate/client/network/sync/src/engine.rs b/substrate/client/network/sync/src/engine.rs
index 25cd3968c2924471dd76b4e4bf1e0f2d5413f8f4..e6e62101ffcd07cb6b08318c03dc660e44679334 100644
--- a/substrate/client/network/sync/src/engine.rs
+++ b/substrate/client/network/sync/src/engine.rs
@@ -24,22 +24,27 @@ use crate::{
 	ChainSync, ClientError, SyncingService,
 };
 
+use codec::{Decode, DecodeAll, Encode};
 use futures::{FutureExt, Stream, StreamExt};
+use futures_timer::Delay;
 use libp2p::PeerId;
 use lru::LruCache;
 use prometheus_endpoint::{
 	register, Gauge, GaugeVec, MetricSource, Opts, PrometheusError, Registry, SourcedGauge, U64,
 };
 
-use codec::{Decode, DecodeAll, Encode};
-use futures_timer::Delay;
 use sc_client_api::{BlockBackend, HeaderBackend, ProofProvider};
 use sc_consensus::import_queue::ImportQueueService;
-use sc_network_common::{
+use sc_network::{
 	config::{
 		NetworkConfiguration, NonDefaultSetConfig, ProtocolId, SyncMode as SyncOperationMode,
 	},
-	protocol::{event::Event, role::Roles, ProtocolName},
+	event::Event,
+	utils::LruHashSet,
+	ProtocolName,
+};
+use sc_network_common::{
+	role::Roles,
 	sync::{
 		message::{
 			generic::{BlockData, BlockResponse},
@@ -49,7 +54,6 @@ use sc_network_common::{
 		BadPeer, ChainSync as ChainSyncT, ExtendedPeerInfo, PollBlockAnnounceValidation, SyncEvent,
 		SyncMode,
 	},
-	utils::LruHashSet,
 };
 use sc_utils::mpsc::{tracing_unbounded, TracingUnboundedReceiver, TracingUnboundedSender};
 use sp_blockchain::HeaderMetadata;
diff --git a/substrate/client/network/sync/src/lib.rs b/substrate/client/network/sync/src/lib.rs
index 23269b02bd128f8749f01cef565bf52cfa97a933..45d14ffa7bb37cf50998c6dcdf9e42b95086206c 100644
--- a/substrate/client/network/sync/src/lib.rs
+++ b/substrate/client/network/sync/src/lib.rs
@@ -28,23 +28,13 @@
 //! the network, or whenever a block has been successfully verified, call the appropriate method in
 //! order to update it.
 
-pub mod block_request_handler;
-pub mod blocks;
-pub mod engine;
-pub mod mock;
-mod schema;
-pub mod service;
-pub mod state;
-pub mod state_request_handler;
-pub mod warp;
-pub mod warp_request_handler;
-
 use crate::{
 	blocks::BlockCollection,
 	schema::v1::{StateRequest, StateResponse},
 	state::StateSync,
 	warp::{WarpProofImportResult, WarpSync},
 };
+
 use codec::{Decode, DecodeAll, Encode};
 use extra_requests::ExtraRequests;
 use futures::{
@@ -52,18 +42,22 @@ use futures::{
 };
 use libp2p::{request_response::OutboundFailure, PeerId};
 use log::{debug, error, info, trace, warn};
-use prometheus_endpoint::{register, Counter, PrometheusError, Registry, U64};
 use prost::Message;
+
+use prometheus_endpoint::{register, Counter, PrometheusError, Registry, U64};
 use sc_client_api::{BlockBackend, ProofProvider};
 use sc_consensus::{
 	import_queue::ImportQueueService, BlockImportError, BlockImportStatus, IncomingBlock,
 };
-use sc_network_common::{
+use sc_network::{
 	config::{
 		NonDefaultSetConfig, NonReservedPeerMode, NotificationHandshake, ProtocolId, SetConfig,
 	},
-	protocol::{role::Roles, ProtocolName},
 	request_responses::{IfDisconnected, RequestFailure},
+	types::ProtocolName,
+};
+use sc_network_common::{
+	role::Roles,
 	sync::{
 		message::{
 			BlockAnnounce, BlockAnnouncesHandshake, BlockAttributes, BlockData, BlockRequest,
@@ -76,7 +70,6 @@ use sc_network_common::{
 		SyncState, SyncStatus,
 	},
 };
-pub use service::chain_sync::SyncingService;
 use sp_arithmetic::traits::Saturating;
 use sp_blockchain::{Error as ClientError, HeaderBackend, HeaderMetadata};
 use sp_consensus::{
@@ -90,6 +83,7 @@ use sp_runtime::{
 	},
 	EncodedJustification, Justifications,
 };
+
 use std::{
 	collections::{hash_map::Entry, HashMap, HashSet},
 	iter,
@@ -97,9 +91,21 @@ use std::{
 	pin::Pin,
 	sync::Arc,
 };
-use warp::TargetBlockImportResult;
+
+pub use service::chain_sync::SyncingService;
 
 mod extra_requests;
+mod schema;
+
+pub mod block_request_handler;
+pub mod blocks;
+pub mod engine;
+pub mod mock;
+pub mod service;
+pub mod state;
+pub mod state_request_handler;
+pub mod warp;
+pub mod warp_request_handler;
 
 /// Maximum blocks to request in a single packet.
 const MAX_BLOCKS_TO_REQUEST: usize = 64;
@@ -927,9 +933,9 @@ where
 								match warp_sync.import_target_block(
 									blocks.pop().expect("`blocks` len checked above."),
 								) {
-									TargetBlockImportResult::Success =>
+									warp::TargetBlockImportResult::Success =>
 										return Ok(OnBlockData::Continue),
-									TargetBlockImportResult::BadResponse =>
+									warp::TargetBlockImportResult::BadResponse =>
 										return Err(BadPeer(*who, rep::VERIFICATION_FAIL)),
 								}
 							} else if blocks.is_empty() {
@@ -3160,7 +3166,7 @@ mod test {
 	use futures::{executor::block_on, future::poll_fn};
 	use sc_block_builder::BlockBuilderProvider;
 	use sc_network_common::{
-		protocol::role::Role,
+		role::Role,
 		sync::message::{BlockData, BlockState, FromBlock},
 	};
 	use sp_blockchain::HeaderBackend;
diff --git a/substrate/client/network/sync/src/service/chain_sync.rs b/substrate/client/network/sync/src/service/chain_sync.rs
index 99b4197740eda152901b98d236b73530749d8d74..f9e0e401fdf8fad5054cd1b8bb0dfe806e4ee3ea 100644
--- a/substrate/client/network/sync/src/service/chain_sync.rs
+++ b/substrate/client/network/sync/src/service/chain_sync.rs
@@ -20,9 +20,9 @@ use futures::{channel::oneshot, Stream};
 use libp2p::PeerId;
 
 use sc_consensus::{BlockImportError, BlockImportStatus, JustificationSyncLink, Link};
-use sc_network_common::{
-	service::{NetworkBlock, NetworkSyncForkRequest},
-	sync::{ExtendedPeerInfo, SyncEvent, SyncEventStream, SyncStatus, SyncStatusProvider},
+use sc_network::{NetworkBlock, NetworkSyncForkRequest};
+use sc_network_common::sync::{
+	ExtendedPeerInfo, SyncEvent, SyncEventStream, SyncStatus, SyncStatusProvider,
 };
 use sc_utils::mpsc::{tracing_unbounded, TracingUnboundedSender};
 use sp_runtime::traits::{Block as BlockT, NumberFor};
diff --git a/substrate/client/network/sync/src/service/mock.rs b/substrate/client/network/sync/src/service/mock.rs
index 2853616adfb4d62baac9de9d518f3f6324081cf8..c882633993c8bb9edb4e54796c9cc392bddaeb5b 100644
--- a/substrate/client/network/sync/src/service/mock.rs
+++ b/substrate/client/network/sync/src/service/mock.rs
@@ -18,18 +18,18 @@
 
 use futures::channel::oneshot;
 use libp2p::{Multiaddr, PeerId};
+
 use sc_consensus::{BlockImportError, BlockImportStatus};
-use sc_network_common::{
+use sc_network::{
 	config::MultiaddrWithPeerId,
-	protocol::ProtocolName,
 	request_responses::{IfDisconnected, RequestFailure},
-	service::{
-		NetworkNotification, NetworkPeers, NetworkRequest, NetworkSyncForkRequest,
-		NotificationSender, NotificationSenderError,
-	},
+	types::ProtocolName,
+	NetworkNotification, NetworkPeers, NetworkRequest, NetworkSyncForkRequest,
+	NotificationSenderError, NotificationSenderT,
 };
 use sc_peerset::ReputationChange;
 use sp_runtime::traits::{Block as BlockT, NumberFor};
+
 use std::collections::HashSet;
 
 mockall::mock! {
@@ -135,7 +135,7 @@ mockall::mock! {
 			&self,
 			target: PeerId,
 			protocol: ProtocolName,
-		) -> Result<Box<dyn NotificationSender>, NotificationSenderError>;
+		) -> Result<Box<dyn NotificationSenderT>, NotificationSenderError>;
 		fn set_notification_handshake(&self, protocol: ProtocolName, handshake: Vec<u8>);
 	}
 }
diff --git a/substrate/client/network/sync/src/service/network.rs b/substrate/client/network/sync/src/service/network.rs
index a1f4f27bbbd99246776fa31205720bacd692d98f..f87de1c4c3ecc429365937e9d8c086194c6522e0 100644
--- a/substrate/client/network/sync/src/service/network.rs
+++ b/substrate/client/network/sync/src/service/network.rs
@@ -18,13 +18,15 @@
 
 use futures::{channel::oneshot, StreamExt};
 use libp2p::PeerId;
-use sc_network_common::{
-	protocol::ProtocolName,
+
+use sc_network::{
 	request_responses::{IfDisconnected, RequestFailure},
-	service::{NetworkNotification, NetworkPeers, NetworkRequest},
+	types::ProtocolName,
+	NetworkNotification, NetworkPeers, NetworkRequest,
 };
 use sc_peerset::ReputationChange;
 use sc_utils::mpsc::{tracing_unbounded, TracingUnboundedReceiver, TracingUnboundedSender};
+
 use std::sync::Arc;
 
 /// Network-related services required by `sc-network-sync`
diff --git a/substrate/client/network/sync/src/state_request_handler.rs b/substrate/client/network/sync/src/state_request_handler.rs
index 2f615f4ead753fa862977b751ae6ea60061ce767..0ce2c541bf92e88283ab2fc5d2233e7956267f93 100644
--- a/substrate/client/network/sync/src/state_request_handler.rs
+++ b/substrate/client/network/sync/src/state_request_handler.rs
@@ -18,6 +18,7 @@
 //! `crate::request_responses::RequestResponsesBehaviour`.
 
 use crate::schema::v1::{KeyValueStateEntry, StateEntry, StateRequest, StateResponse};
+
 use codec::{Decode, Encode};
 use futures::{
 	channel::{mpsc, oneshot},
@@ -27,12 +28,14 @@ use libp2p::PeerId;
 use log::{debug, trace};
 use lru::LruCache;
 use prost::Message;
+
 use sc_client_api::{BlockBackend, ProofProvider};
-use sc_network_common::{
+use sc_network::{
 	config::ProtocolId,
 	request_responses::{IncomingRequest, OutgoingResponse, ProtocolConfig},
 };
 use sp_runtime::traits::Block as BlockT;
+
 use std::{
 	hash::{Hash, Hasher},
 	num::NonZeroUsize,
diff --git a/substrate/client/network/sync/src/warp_request_handler.rs b/substrate/client/network/sync/src/warp_request_handler.rs
index fcb0d116bcdac9d7c31160e48d44a2e4353b06fc..7061d6485d092443018bcac592c40e6a2658816c 100644
--- a/substrate/client/network/sync/src/warp_request_handler.rs
+++ b/substrate/client/network/sync/src/warp_request_handler.rs
@@ -22,14 +22,16 @@ use futures::{
 	stream::StreamExt,
 };
 use log::debug;
-use sc_network_common::{
+
+use sc_network::{
 	config::ProtocolId,
 	request_responses::{
 		IncomingRequest, OutgoingResponse, ProtocolConfig as RequestResponseConfig,
 	},
-	sync::warp::{EncodedProof, WarpProofRequest, WarpSyncProvider},
 };
+use sc_network_common::sync::warp::{EncodedProof, WarpProofRequest, WarpSyncProvider};
 use sp_runtime::traits::Block as BlockT;
+
 use std::{sync::Arc, time::Duration};
 
 const MAX_RESPONSE_SIZE: u64 = 16 * 1024 * 1024;
diff --git a/substrate/client/network/test/src/lib.rs b/substrate/client/network/test/src/lib.rs
index a79e17e2fb6d1156c49702493ecb52f04570009a..75b8287b08dcff9f114230a76ebf653334583d0f 100644
--- a/substrate/client/network/test/src/lib.rs
+++ b/substrate/client/network/test/src/lib.rs
@@ -20,6 +20,8 @@
 #[cfg(test)]
 mod block_import;
 #[cfg(test)]
+mod service;
+#[cfg(test)]
 mod sync;
 
 use std::{
@@ -46,14 +48,18 @@ use sc_consensus::{
 	ForkChoiceStrategy, ImportQueue, ImportResult, JustificationImport, JustificationSyncLink,
 	LongestChain, Verifier,
 };
-use sc_network::{Multiaddr, NetworkService, NetworkWorker};
-use sc_network_common::{
+use sc_network::{
 	config::{
 		MultiaddrWithPeerId, NetworkConfiguration, NonDefaultSetConfig, NonReservedPeerMode,
-		ProtocolId, RequestResponseConfig, Role, SyncMode, TransportConfig,
+		ProtocolId, Role, SyncMode, TransportConfig,
 	},
-	protocol::{role::Roles, ProtocolName},
-	service::{NetworkBlock, NetworkEventStream, NetworkStateInfo, NetworkSyncForkRequest},
+	request_responses::ProtocolConfig as RequestResponseConfig,
+	types::ProtocolName,
+	Multiaddr, NetworkBlock, NetworkEventStream, NetworkService, NetworkStateInfo,
+	NetworkSyncForkRequest, NetworkWorker,
+};
+use sc_network_common::{
+	role::Roles,
 	sync::warp::{
 		AuthorityList, EncodedProof, SetId, VerificationResult, WarpSyncParams, WarpSyncProvider,
 	},
diff --git a/substrate/client/network/src/service/tests/service.rs b/substrate/client/network/test/src/service.rs
similarity index 72%
rename from substrate/client/network/src/service/tests/service.rs
rename to substrate/client/network/test/src/service.rs
index 9c4c0ad6e0cd96215170886020b5b6e0b1f859e9..b1de2a91ebcc9b185cb00a1e3ba535d790a41f6b 100644
--- a/substrate/client/network/src/service/tests/service.rs
+++ b/substrate/client/network/test/src/service.rs
@@ -16,24 +16,228 @@
 // You should have received a copy of the GNU General Public License
 // along with this program. If not, see <https://www.gnu.org/licenses/>.
 
-use crate::{config, service::tests::TestNetworkBuilder, NetworkService};
-
 use futures::prelude::*;
-use libp2p::PeerId;
-use sc_network_common::{
-	config::{MultiaddrWithPeerId, NonDefaultSetConfig, SetConfig, TransportConfig},
-	protocol::event::Event,
-	service::{NetworkNotification, NetworkPeers, NetworkStateInfo},
+use libp2p::{Multiaddr, PeerId};
+
+use sc_consensus::{ImportQueue, Link};
+use sc_network::{
+	config::{self, MultiaddrWithPeerId, ProtocolId, TransportConfig},
+	event::Event,
+	NetworkEventStream, NetworkNotification, NetworkPeers, NetworkService, NetworkStateInfo,
+	NetworkWorker,
+};
+use sc_network_common::role::Roles;
+use sc_network_light::light_client_requests::handler::LightClientRequestHandler;
+use sc_network_sync::{
+	block_request_handler::BlockRequestHandler,
+	engine::SyncingEngine,
+	service::network::{NetworkServiceHandle, NetworkServiceProvider},
+	state_request_handler::StateRequestHandler,
 };
+use sp_runtime::traits::Block as BlockT;
+use substrate_test_runtime_client::{
+	runtime::{Block as TestBlock, Hash as TestHash},
+	TestClientBuilder, TestClientBuilderExt as _,
+};
+
 use std::{sync::Arc, time::Duration};
 
-type TestNetworkService = NetworkService<
-	substrate_test_runtime_client::runtime::Block,
-	substrate_test_runtime_client::runtime::Hash,
->;
+type TestNetworkWorker = NetworkWorker<TestBlock, TestHash>;
+type TestNetworkService = NetworkService<TestBlock, TestHash>;
 
 const PROTOCOL_NAME: &str = "/foo";
 
+struct TestNetwork {
+	network: TestNetworkWorker,
+}
+
+impl TestNetwork {
+	pub fn new(network: TestNetworkWorker) -> Self {
+		Self { network }
+	}
+
+	pub fn start_network(
+		self,
+	) -> (Arc<TestNetworkService>, (impl Stream<Item = Event> + std::marker::Unpin)) {
+		let worker = self.network;
+		let service = worker.service().clone();
+		let event_stream = service.event_stream("test");
+
+		tokio::spawn(worker.run());
+
+		(service, event_stream)
+	}
+}
+
+struct TestNetworkBuilder {
+	import_queue: Option<Box<dyn ImportQueue<TestBlock>>>,
+	link: Option<Box<dyn Link<TestBlock>>>,
+	client: Option<Arc<substrate_test_runtime_client::TestClient>>,
+	listen_addresses: Vec<Multiaddr>,
+	set_config: Option<config::SetConfig>,
+	chain_sync_network: Option<(NetworkServiceProvider, NetworkServiceHandle)>,
+	config: Option<config::NetworkConfiguration>,
+}
+
+impl TestNetworkBuilder {
+	pub fn new() -> Self {
+		Self {
+			import_queue: None,
+			link: None,
+			client: None,
+			listen_addresses: Vec::new(),
+			set_config: None,
+			chain_sync_network: None,
+			config: None,
+		}
+	}
+
+	pub fn with_config(mut self, config: config::NetworkConfiguration) -> Self {
+		self.config = Some(config);
+		self
+	}
+
+	pub fn with_listen_addresses(mut self, addresses: Vec<Multiaddr>) -> Self {
+		self.listen_addresses = addresses;
+		self
+	}
+
+	pub fn with_set_config(mut self, set_config: config::SetConfig) -> Self {
+		self.set_config = Some(set_config);
+		self
+	}
+
+	pub fn build(mut self) -> TestNetwork {
+		let client = self.client.as_mut().map_or(
+			Arc::new(TestClientBuilder::with_default_backend().build_with_longest_chain().0),
+			|v| v.clone(),
+		);
+
+		let network_config = self.config.unwrap_or(config::NetworkConfiguration {
+			extra_sets: vec![config::NonDefaultSetConfig {
+				notifications_protocol: PROTOCOL_NAME.into(),
+				fallback_names: Vec::new(),
+				max_notification_size: 1024 * 1024,
+				handshake: None,
+				set_config: self.set_config.unwrap_or_default(),
+			}],
+			listen_addresses: self.listen_addresses,
+			transport: TransportConfig::MemoryOnly,
+			..config::NetworkConfiguration::new_local()
+		});
+
+		#[derive(Clone)]
+		struct PassThroughVerifier(bool);
+
+		#[async_trait::async_trait]
+		impl<B: BlockT> sc_consensus::Verifier<B> for PassThroughVerifier {
+			async fn verify(
+				&mut self,
+				mut block: sc_consensus::BlockImportParams<B, ()>,
+			) -> Result<sc_consensus::BlockImportParams<B, ()>, String> {
+				block.finalized = self.0;
+				block.fork_choice = Some(sc_consensus::ForkChoiceStrategy::LongestChain);
+				Ok(block)
+			}
+		}
+
+		let mut import_queue =
+			self.import_queue.unwrap_or(Box::new(sc_consensus::BasicQueue::new(
+				PassThroughVerifier(false),
+				Box::new(client.clone()),
+				None,
+				&sp_core::testing::TaskExecutor::new(),
+				None,
+			)));
+
+		let protocol_id = ProtocolId::from("test-protocol-name");
+		let fork_id = Some(String::from("test-fork-id"));
+
+		let block_request_protocol_config = {
+			let (handler, protocol_config) =
+				BlockRequestHandler::new(&protocol_id, None, client.clone(), 50);
+			tokio::spawn(handler.run().boxed());
+			protocol_config
+		};
+
+		let state_request_protocol_config = {
+			let (handler, protocol_config) =
+				StateRequestHandler::new(&protocol_id, None, client.clone(), 50);
+			tokio::spawn(handler.run().boxed());
+			protocol_config
+		};
+
+		let light_client_request_protocol_config = {
+			let (handler, protocol_config) =
+				LightClientRequestHandler::new(&protocol_id, None, client.clone());
+			tokio::spawn(handler.run().boxed());
+			protocol_config
+		};
+
+		let (chain_sync_network_provider, chain_sync_network_handle) =
+			self.chain_sync_network.unwrap_or(NetworkServiceProvider::new());
+
+		let (engine, chain_sync_service, block_announce_config) = SyncingEngine::new(
+			Roles::from(&config::Role::Full),
+			client.clone(),
+			None,
+			&network_config,
+			protocol_id.clone(),
+			&None,
+			Box::new(sp_consensus::block_validation::DefaultBlockAnnounceValidator),
+			None,
+			chain_sync_network_handle,
+			import_queue.service(),
+			block_request_protocol_config.name.clone(),
+			state_request_protocol_config.name.clone(),
+			None,
+		)
+		.unwrap();
+		let mut link = self.link.unwrap_or(Box::new(chain_sync_service.clone()));
+		let worker = NetworkWorker::<
+			substrate_test_runtime_client::runtime::Block,
+			substrate_test_runtime_client::runtime::Hash,
+		>::new(config::Params {
+			block_announce_config,
+			role: config::Role::Full,
+			executor: Box::new(|f| {
+				tokio::spawn(f);
+			}),
+			network_config,
+			chain: client.clone(),
+			protocol_id,
+			fork_id,
+			metrics_registry: None,
+			request_response_protocol_configs: [
+				block_request_protocol_config,
+				state_request_protocol_config,
+				light_client_request_protocol_config,
+			]
+			.to_vec(),
+		})
+		.unwrap();
+
+		let service = worker.service().clone();
+		tokio::spawn(async move {
+			let _ = chain_sync_network_provider.run(service).await;
+		});
+		tokio::spawn(async move {
+			loop {
+				futures::future::poll_fn(|cx| {
+					import_queue.poll_actions(cx, &mut *link);
+					std::task::Poll::Ready(())
+				})
+				.await;
+				tokio::time::sleep(std::time::Duration::from_millis(250)).await;
+			}
+		});
+		let stream = worker.service().event_stream("syncing");
+		tokio::spawn(engine.run(stream));
+
+		TestNetwork::new(worker)
+	}
+}
+
 /// Builds two nodes and their associated events stream.
 /// The nodes are connected together and have the `PROTOCOL_NAME` protocol registered.
 fn build_nodes_one_proto() -> (
@@ -50,7 +254,7 @@ fn build_nodes_one_proto() -> (
 		.start_network();
 
 	let (node2, events_stream2) = TestNetworkBuilder::new()
-		.with_set_config(SetConfig {
+		.with_set_config(config::SetConfig {
 			reserved_nodes: vec![MultiaddrWithPeerId {
 				multiaddr: listen_addr,
 				peer_id: node1.local_peer_id(),
@@ -208,7 +412,7 @@ async fn lots_of_incoming_peers_works() {
 
 	let (main_node, _) = TestNetworkBuilder::new()
 		.with_listen_addresses(vec![listen_addr.clone()])
-		.with_set_config(SetConfig { in_peers: u32::MAX, ..Default::default() })
+		.with_set_config(config::SetConfig { in_peers: u32::MAX, ..Default::default() })
 		.build()
 		.start_network();
 
@@ -220,7 +424,7 @@ async fn lots_of_incoming_peers_works() {
 
 	for _ in 0..32 {
 		let (_dialing_node, event_stream) = TestNetworkBuilder::new()
-			.with_set_config(SetConfig {
+			.with_set_config(config::SetConfig {
 				reserved_nodes: vec![MultiaddrWithPeerId {
 					multiaddr: listen_addr.clone(),
 					peer_id: main_node_peer_id,
@@ -289,10 +493,11 @@ async fn notifications_back_pressure() {
 
 		while received_notifications < TOTAL_NOTIFS {
 			match events_stream2.next().await.unwrap() {
-				Event::NotificationStreamOpened { protocol, .. } =>
+				Event::NotificationStreamOpened { protocol, .. } => {
 					if let None = sync_protocol_name {
 						sync_protocol_name = Some(protocol);
-					},
+					}
+				},
 				Event::NotificationStreamClosed { protocol, .. } => {
 					if Some(&protocol) != sync_protocol_name.as_ref() {
 						panic!()
@@ -344,7 +549,7 @@ async fn fallback_name_working() {
 	let listen_addr = config::build_multiaddr![Memory(rand::random::<u64>())];
 	let (node1, mut events_stream1) = TestNetworkBuilder::new()
 		.with_config(config::NetworkConfiguration {
-			extra_sets: vec![NonDefaultSetConfig {
+			extra_sets: vec![config::NonDefaultSetConfig {
 				notifications_protocol: NEW_PROTOCOL_NAME.into(),
 				fallback_names: vec![PROTOCOL_NAME.into()],
 				max_notification_size: 1024 * 1024,
@@ -359,7 +564,7 @@ async fn fallback_name_working() {
 		.start_network();
 
 	let (_, mut events_stream2) = TestNetworkBuilder::new()
-		.with_set_config(SetConfig {
+		.with_set_config(config::SetConfig {
 			reserved_nodes: vec![MultiaddrWithPeerId {
 				multiaddr: listen_addr,
 				peer_id: node1.local_peer_id(),
@@ -500,7 +705,7 @@ async fn ensure_reserved_node_addresses_consistent_with_transport_memory() {
 		.with_config(config::NetworkConfiguration {
 			listen_addresses: vec![listen_addr.clone()],
 			transport: TransportConfig::MemoryOnly,
-			default_peers_set: SetConfig {
+			default_peers_set: config::SetConfig {
 				reserved_nodes: vec![reserved_node],
 				..Default::default()
 			},
@@ -527,7 +732,7 @@ async fn ensure_reserved_node_addresses_consistent_with_transport_not_memory() {
 	let _ = TestNetworkBuilder::new()
 		.with_config(config::NetworkConfiguration {
 			listen_addresses: vec![listen_addr.clone()],
-			default_peers_set: SetConfig {
+			default_peers_set: config::SetConfig {
 				reserved_nodes: vec![reserved_node],
 				..Default::default()
 			},
diff --git a/substrate/client/network/transactions/Cargo.toml b/substrate/client/network/transactions/Cargo.toml
index cab702fbd7a6c7519042e69bac81b68648de2389..3616473d3baedc05fbe306c76c3c65a4a04e8244 100644
--- a/substrate/client/network/transactions/Cargo.toml
+++ b/substrate/client/network/transactions/Cargo.toml
@@ -20,6 +20,7 @@ libp2p = "0.50.0"
 log = "0.4.17"
 pin-project = "1.0.12"
 prometheus-endpoint = { package = "substrate-prometheus-endpoint", version = "0.10.0-dev", path = "../../../utils/prometheus" }
+sc-network = { version = "0.10.0-dev", path = "../" }
 sc-network-common = { version = "0.10.0-dev", path = "../common" }
 sc-peerset = { version = "4.0.0-dev", path = "../../peerset" }
 sc-utils = { version = "4.0.0-dev", path = "../../utils" }
diff --git a/substrate/client/network/transactions/src/lib.rs b/substrate/client/network/transactions/src/lib.rs
index 48bb394946671f73698e5f113348f1a06580ada6..381dd654b600b3966ddff289d29b621bc190965b 100644
--- a/substrate/client/network/transactions/src/lib.rs
+++ b/substrate/client/network/transactions/src/lib.rs
@@ -27,22 +27,29 @@
 //! `Future` that processes transactions.
 
 use crate::config::*;
+
 use codec::{Decode, Encode};
 use futures::{prelude::*, stream::FuturesUnordered};
 use libp2p::{multiaddr, PeerId};
 use log::{debug, trace, warn};
+
 use prometheus_endpoint::{register, Counter, PrometheusError, Registry, U64};
-use sc_network_common::{
+use sc_network::{
 	config::{NonDefaultSetConfig, NonReservedPeerMode, ProtocolId, SetConfig},
 	error,
-	protocol::{event::Event, role::ObservedRole, ProtocolName},
-	service::{NetworkEventStream, NetworkNotification, NetworkPeers},
-	sync::{SyncEvent, SyncEventStream},
+	event::Event,
+	types::ProtocolName,
 	utils::{interval, LruHashSet},
+	NetworkEventStream, NetworkNotification, NetworkPeers,
+};
+use sc_network_common::{
+	role::ObservedRole,
+	sync::{SyncEvent, SyncEventStream},
 	ExHashT,
 };
 use sc_utils::mpsc::{tracing_unbounded, TracingUnboundedReceiver, TracingUnboundedSender};
 use sp_runtime::traits::Block as BlockT;
+
 use std::{
 	collections::{hash_map::Entry, HashMap},
 	iter,
diff --git a/substrate/client/offchain/Cargo.toml b/substrate/client/offchain/Cargo.toml
index dd6e2e44caf55978832332e5546f21637978a63b..0307e3125f3ee8a48c45cea00106fa44f58cac89 100644
--- a/substrate/client/offchain/Cargo.toml
+++ b/substrate/client/offchain/Cargo.toml
@@ -29,6 +29,7 @@ rand = "0.8.5"
 threadpool = "1.7"
 tracing = "0.1.29"
 sc-client-api = { version = "4.0.0-dev", path = "../api" }
+sc-network = { version = "0.10.0-dev", path = "../network" }
 sc-network-common = { version = "0.10.0-dev", path = "../network/common" }
 sc-peerset = { version = "4.0.0-dev", path = "../peerset" }
 sc-utils = { version = "4.0.0-dev", path = "../utils" }
diff --git a/substrate/client/offchain/src/api.rs b/substrate/client/offchain/src/api.rs
index 6fdd91cda2390389b86e3f90b714394fbb241989..a15f03bab6f843d85111dac01c42be76dd404597 100644
--- a/substrate/client/offchain/src/api.rs
+++ b/substrate/client/offchain/src/api.rs
@@ -326,10 +326,8 @@ mod tests {
 	use super::*;
 	use libp2p::PeerId;
 	use sc_client_db::offchain::LocalStorage;
-	use sc_network_common::{
-		config::MultiaddrWithPeerId,
-		protocol::ProtocolName,
-		service::{NetworkPeers, NetworkStateInfo},
+	use sc_network::{
+		config::MultiaddrWithPeerId, types::ProtocolName, NetworkPeers, NetworkStateInfo,
 	};
 	use sc_peerset::ReputationChange;
 	use sp_core::offchain::{DbExternalities, Externalities};
diff --git a/substrate/client/offchain/src/lib.rs b/substrate/client/offchain/src/lib.rs
index c69f01de19bf6b8f8b99a43a346b0324a9e5b74c..677d89267e3a6a9b8d4f39d9d51df64a76e4ab3c 100644
--- a/substrate/client/offchain/src/lib.rs
+++ b/substrate/client/offchain/src/lib.rs
@@ -42,7 +42,7 @@ use futures::{
 	prelude::*,
 };
 use parking_lot::Mutex;
-use sc_network_common::service::{NetworkPeers, NetworkStateInfo};
+use sc_network::{NetworkPeers, NetworkStateInfo};
 use sp_api::{ApiExt, ProvideRuntimeApi};
 use sp_core::{offchain, traits::SpawnNamed, ExecutionContext};
 use sp_runtime::traits::{self, Header};
@@ -246,7 +246,7 @@ mod tests {
 	use libp2p::{Multiaddr, PeerId};
 	use sc_block_builder::BlockBuilderProvider as _;
 	use sc_client_api::Backend as _;
-	use sc_network_common::{config::MultiaddrWithPeerId, protocol::ProtocolName};
+	use sc_network::{config::MultiaddrWithPeerId, types::ProtocolName};
 	use sc_peerset::ReputationChange;
 	use sc_transaction_pool::{BasicPool, FullChainApi};
 	use sc_transaction_pool_api::{InPoolTransaction, TransactionPool};
diff --git a/substrate/client/rpc/src/system/tests.rs b/substrate/client/rpc/src/system/tests.rs
index c0ee1e8f880054c550f8a1ca764435091c404833..b6bfec7736b088f8b42192de10bc07614fb5bd86 100644
--- a/substrate/client/rpc/src/system/tests.rs
+++ b/substrate/client/rpc/src/system/tests.rs
@@ -99,7 +99,7 @@ fn api<T: Into<Option<Status>>>(sync: T) -> RpcModule<System<Block>> {
 					);
 				},
 				Request::NetworkAddReservedPeer(peer, sender) => {
-					let _ = match sc_network_common::config::parse_str_addr(&peer) {
+					let _ = match sc_network::config::parse_str_addr(&peer) {
 						Ok(_) => sender.send(Ok(())),
 						Err(s) =>
 							sender.send(Err(error::Error::MalformattedPeerArg(s.to_string()))),
diff --git a/substrate/client/service/src/builder.rs b/substrate/client/service/src/builder.rs
index ea4b630003123dd5fc88184aba70e6abe4cd9c99..91ef65cf134e421001e11837fdf3db6bcdf96026 100644
--- a/substrate/client/service/src/builder.rs
+++ b/substrate/client/service/src/builder.rs
@@ -38,14 +38,11 @@ use sc_client_db::{Backend, DatabaseSettings};
 use sc_consensus::import_queue::ImportQueue;
 use sc_executor::RuntimeVersionOf;
 use sc_keystore::LocalKeystore;
-use sc_network::NetworkService;
-use sc_network_bitswap::BitswapRequestHandler;
-use sc_network_common::{
-	config::SyncMode,
-	protocol::role::Roles,
-	service::{NetworkEventStream, NetworkStateInfo, NetworkStatusProvider},
-	sync::warp::WarpSyncParams,
+use sc_network::{
+	config::SyncMode, NetworkEventStream, NetworkService, NetworkStateInfo, NetworkStatusProvider,
 };
+use sc_network_bitswap::BitswapRequestHandler;
+use sc_network_common::{role::Roles, sync::warp::WarpSyncParams};
 use sc_network_light::light_client_requests::handler::LightClientRequestHandler;
 use sc_network_sync::{
 	block_request_handler::BlockRequestHandler, engine::SyncingEngine,
diff --git a/substrate/client/service/src/config.rs b/substrate/client/service/src/config.rs
index 8e843b58f285e0844b031e645c8d45000cfc2f79..c7d98a45334364e89a12fa10d8f7426b2303d49c 100644
--- a/substrate/client/service/src/config.rs
+++ b/substrate/client/service/src/config.rs
@@ -22,22 +22,18 @@ pub use sc_client_api::execution_extensions::{ExecutionStrategies, ExecutionStra
 pub use sc_client_db::{BlocksPruning, Database, DatabaseSource, PruningMode};
 pub use sc_executor::{WasmExecutionMethod, WasmtimeInstantiationStrategy};
 pub use sc_network::{
-	config::{NetworkConfiguration, Role},
-	Multiaddr,
-};
-pub use sc_network_common::{
 	config::{
-		MultiaddrWithPeerId, NodeKeyConfig, NonDefaultSetConfig, ProtocolId, SetConfig,
-		TransportConfig,
+		MultiaddrWithPeerId, NetworkConfiguration, NodeKeyConfig, NonDefaultSetConfig, ProtocolId,
+		Role, SetConfig, SyncMode, TransportConfig,
 	},
 	request_responses::{
 		IncomingRequest, OutgoingResponse, ProtocolConfig as RequestResponseConfig,
 	},
+	Multiaddr,
 };
 
 use prometheus_endpoint::Registry;
 use sc_chain_spec::ChainSpec;
-use sc_network_common::config::SyncMode;
 pub use sc_telemetry::TelemetryEndpoints;
 pub use sc_transaction_pool::Options as TransactionPoolOptions;
 use sp_core::crypto::SecretString;
diff --git a/substrate/client/service/src/error.rs b/substrate/client/service/src/error.rs
index 6b71e46b4e0efc7bf4d71f6c5c99b4f8507322c7..c871342c771ebfb91ea90032b85dd745ba49dee6 100644
--- a/substrate/client/service/src/error.rs
+++ b/substrate/client/service/src/error.rs
@@ -40,7 +40,7 @@ pub enum Error {
 	Consensus(#[from] sp_consensus::Error),
 
 	#[error(transparent)]
-	Network(#[from] sc_network_common::error::Error),
+	Network(#[from] sc_network::error::Error),
 
 	#[error(transparent)]
 	Keystore(#[from] sc_keystore::Error),
diff --git a/substrate/client/service/src/lib.rs b/substrate/client/service/src/lib.rs
index 9dab81a5b4ed99387838017e498dc9cf16e9e6f9..54f11ec25a02aca052b114eafcaeec204d55cc48 100644
--- a/substrate/client/service/src/lib.rs
+++ b/substrate/client/service/src/lib.rs
@@ -41,10 +41,8 @@ use futures::{channel::mpsc, pin_mut, FutureExt, StreamExt};
 use jsonrpsee::{core::Error as JsonRpseeError, RpcModule};
 use log::{debug, error, warn};
 use sc_client_api::{blockchain::HeaderBackend, BlockBackend, BlockchainEvents, ProofProvider};
-use sc_network::{NetworkStateInfo, PeerId};
-use sc_network_common::{
-	config::MultiaddrWithPeerId,
-	service::{NetworkBlock, NetworkPeers},
+use sc_network::{
+	config::MultiaddrWithPeerId, NetworkBlock, NetworkPeers, NetworkStateInfo, PeerId,
 };
 use sc_network_sync::SyncingService;
 use sc_utils::mpsc::TracingUnboundedReceiver;
diff --git a/substrate/client/service/src/metrics.rs b/substrate/client/service/src/metrics.rs
index 967e3133dbea94fe59af529666bd6bd5041b1034..ece5758be771881bbac5940375ec6d7b5a8180de 100644
--- a/substrate/client/service/src/metrics.rs
+++ b/substrate/client/service/src/metrics.rs
@@ -22,11 +22,8 @@ use crate::config::Configuration;
 use futures_timer::Delay;
 use prometheus_endpoint::{register, Gauge, GaugeVec, Opts, PrometheusError, Registry, U64};
 use sc_client_api::{ClientInfo, UsageProvider};
-use sc_network::config::Role;
-use sc_network_common::{
-	service::{NetworkStatus, NetworkStatusProvider},
-	sync::{SyncStatus, SyncStatusProvider},
-};
+use sc_network::{config::Role, NetworkStatus, NetworkStatusProvider};
+use sc_network_common::sync::{SyncStatus, SyncStatusProvider};
 use sc_telemetry::{telemetry, TelemetryHandle, SUBSTRATE_INFO};
 use sc_transaction_pool_api::{MaintainedTransactionPool, PoolStatus};
 use sc_utils::metrics::register_globals;
diff --git a/substrate/client/service/test/src/lib.rs b/substrate/client/service/test/src/lib.rs
index b1a09a0620fcddbd89b7cba631fcb7142e8f8190..f80446a4d43eb43d17e47f9bd97792a26e4529a1 100644
--- a/substrate/client/service/test/src/lib.rs
+++ b/substrate/client/service/test/src/lib.rs
@@ -22,10 +22,9 @@ use futures::{task::Poll, Future, TryFutureExt as _};
 use log::{debug, info};
 use parking_lot::Mutex;
 use sc_client_api::{Backend, CallExecutor};
-use sc_network::{config::NetworkConfiguration, multiaddr};
-use sc_network_common::{
-	config::{MultiaddrWithPeerId, TransportConfig},
-	service::{NetworkBlock, NetworkPeers, NetworkStateInfo},
+use sc_network::{
+	config::{MultiaddrWithPeerId, NetworkConfiguration, TransportConfig},
+	multiaddr, NetworkBlock, NetworkPeers, NetworkStateInfo,
 };
 use sc_network_sync::SyncingService;
 use sc_service::{