diff --git a/Cargo.lock b/Cargo.lock
index 925535d8a..78f04a9ea 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -289,6 +289,7 @@ dependencies = [
  "ethcore-ipc 1.4.0",
  "ethcore-ipc-codegen 1.4.0",
  "ethcore-ipc-nano 1.4.0",
+ "ethcore-network 1.5.0",
  "ethcore-util 1.5.0",
  "ethjson 0.1.0",
  "ethkey 0.2.0",
diff --git a/ethcore/Cargo.toml b/ethcore/Cargo.toml
index 667b40ace..825d9ffd1 100644
--- a/ethcore/Cargo.toml
+++ b/ethcore/Cargo.toml
@@ -41,6 +41,7 @@ ethcore-ipc-nano = { path = "../ipc/nano" }
 rlp = { path = "../util/rlp" }
 lru-cache = "0.1.0"
 ethcore-bloom-journal = { path = "../util/bloom" }
+ethcore-network = { path = "../util/network" }
 
 [dependencies.hyper]
 git = "https://github.com/ethcore/hyper"
diff --git a/ethcore/src/client/client.rs b/ethcore/src/client/client.rs
index 72356e91d..788596d86 100644
--- a/ethcore/src/client/client.rs
+++ b/ethcore/src/client/client.rs
@@ -1229,7 +1229,7 @@ impl BlockChainClient for Client {
 
 	fn pruning_info(&self) -> PruningInfo {
 		PruningInfo {
-			earliest_chain: self.chain.read().first_block().unwrap_or(1),
+			earliest_chain: self.chain.read().first_block_number().unwrap_or(1),
 			earliest_state: self.state_db.lock().journal_db().earliest_era().unwrap_or(0),
 		}
 	}
diff --git a/ethcore/src/client/test_client.rs b/ethcore/src/client/test_client.rs
index 713c55056..91f0b18ff 100644
--- a/ethcore/src/client/test_client.rs
+++ b/ethcore/src/client/test_client.rs
@@ -655,7 +655,7 @@ impl BlockChainClient for TestBlockChainClient {
 	fn pruning_info(&self) -> PruningInfo {
 		PruningInfo {
 			earliest_chain: 1,
-			earlest_state: 1,
+			earliest_state: 1,
 		}
 	}
 }
diff --git a/ethcore/src/lib.rs b/ethcore/src/lib.rs
index bf3e59171..2c07e7de6 100644
--- a/ethcore/src/lib.rs
+++ b/ethcore/src/lib.rs
@@ -102,6 +102,7 @@ extern crate rlp;
 extern crate ethcore_bloom_journal as bloom_journal;
 extern crate byteorder;
 extern crate transient_hashmap;
+extern crate ethcore_network as network;
 
 #[macro_use]
 extern crate log;
@@ -138,6 +139,7 @@ pub mod snapshot;
 pub mod action_params;
 pub mod db;
 pub mod verification;
+pub mod light;
 #[macro_use] pub mod evm;
 
 mod cache_manager;
diff --git a/ethcore/src/light/client.rs b/ethcore/src/light/client.rs
index e3b5745b2..7b821d971 100644
--- a/ethcore/src/light/client.rs
+++ b/ethcore/src/light/client.rs
@@ -19,21 +19,21 @@
 
 use std::sync::Arc;
 
-use ethcore::engines::Engine;
-use ethcore::ids::BlockID;
-use ethcore::service::ClientIoMessage;
-use ethcore::block_import_error::BlockImportError;
-use ethcore::block_status::BlockStatus;
-use ethcore::verification::queue::{HeaderQueue, QueueInfo};
-use ethcore::transaction::SignedTransaction;
-use ethcore::blockchain_info::BlockChainInfo;
+use engines::Engine;
+use ids::BlockID;
+use service::ClientIoMessage;
+use block_import_error::BlockImportError;
+use block_status::BlockStatus;
+use verification::queue::{HeaderQueue, QueueInfo};
+use transaction::SignedTransaction;
+use blockchain_info::BlockChainInfo;
 
 use io::IoChannel;
 use util::hash::H256;
 use util::{Bytes, Mutex};
 
-use provider::Provider;
-use request;
+use light::provider::Provider;
+use light::request;
 
 /// Light client implementation.
 pub struct Client {
diff --git a/ethcore/src/light/mod.rs b/ethcore/src/light/mod.rs
index d96cedeaf..a7b2d3922 100644
--- a/ethcore/src/light/mod.rs
+++ b/ethcore/src/light/mod.rs
@@ -34,7 +34,5 @@
 pub mod client;
 pub mod net;
 pub mod provider;
-pub mod request;
 
-#[macro_use]
-extern crate log;
\ No newline at end of file
+pub use types::les_request as request;
\ No newline at end of file
diff --git a/ethcore/src/light/net/buffer_flow.rs b/ethcore/src/light/net/buffer_flow.rs
index b7bd30f82..62f351515 100644
--- a/ethcore/src/light/net/buffer_flow.rs
+++ b/ethcore/src/light/net/buffer_flow.rs
@@ -23,7 +23,7 @@
 //! This module provides an interface for configuration of buffer
 //! flow costs and recharge rates.
 
-use request;
+use light::request;
 use super::packet;
 use super::error::Error;
 
diff --git a/ethcore/src/light/net/mod.rs b/ethcore/src/light/net/mod.rs
index e72ce4bb2..47146a2f9 100644
--- a/ethcore/src/light/net/mod.rs
+++ b/ethcore/src/light/net/mod.rs
@@ -28,8 +28,8 @@ use util::RwLock;
 use std::collections::{HashMap, HashSet};
 use std::sync::atomic::AtomicUsize;
 
-use provider::Provider;
-use request::{self, Request};
+use light::provider::Provider;
+use light::request::{self, Request};
 
 use self::buffer_flow::{Buffer, FlowParams};
 use self::error::{Error, Punishment};
@@ -287,11 +287,14 @@ impl LightProtocol {
 		self.flow_params.recharge(&mut present_buffer);
 		let req_id: u64 = try!(data.val_at(0));
 
+		let block = {
+			let rlp = try!(data.at(1));
+			(try!(rlp.val_at(0)), try!(rlp.val_at(1)))
+		};
+
 		let req = request::Headers {
-			block: {
-				let rlp = try!(data.at(1));
-				(try!(rlp.val_at(0)), try!(rlp.val_at(1)))
-			},
+			block_num: block.0,
+			block_hash: block.1,
 			max: ::std::cmp::min(MAX_HEADERS, try!(data.val_at(2))),
 			skip: try!(data.val_at(3)),
 			reverse: try!(data.val_at(4)),
diff --git a/ethcore/src/light/provider.rs b/ethcore/src/light/provider.rs
index 3cabe3feb..481865643 100644
--- a/ethcore/src/light/provider.rs
+++ b/ethcore/src/light/provider.rs
@@ -17,14 +17,14 @@
 //! A provider for the LES protocol. This is typically a full node, who can
 //! give as much data as necessary to its peers.
 
-use ethcore::client::BlockChainClient;
-use ethcore::transaction::SignedTransaction;
-use ethcore::blockchain_info::BlockChainInfo;
+use client::BlockChainClient;
+use transaction::SignedTransaction;
+use blockchain_info::BlockChainInfo;
 
 use rlp::EMPTY_LIST_RLP;
 use util::{Bytes, H256};
 
-use request;
+use light::request;
 
 /// Defines the operations that a provider for `LES` must fulfill.
 ///
@@ -40,8 +40,8 @@ pub trait Provider: Send + Sync {
 	fn reorg_depth(&self, a: &H256, b: &H256) -> Option<u64>;
 
 	/// Earliest block where state queries are available.
-	/// All states between this value and
-	fn earliest_state(&self) -> u64;
+	/// If `None`, no state queries are servable.
+	fn earliest_state(&self) -> Option<u64>;
 
 	/// Provide a list of headers starting at the requested block,
 	/// possibly in reverse and skipping `skip` at a time.
@@ -83,11 +83,11 @@ impl<T: BlockChainClient + ?Sized> Provider for T {
 	}
 
 	fn reorg_depth(&self, a: &H256, b: &H256) -> Option<u64> {
-		self.tree_route.map(|route| route.index as u64)
+		self.tree_route(a, b).map(|route| route.index as u64)
 	}
 
-	fn earliest_state(&self) -> u64 {
-		self.pruning_info().earliest_state
+	fn earliest_state(&self) -> Option<u64> {
+		Some(self.pruning_info().earliest_state)
 	}
 
 	fn block_headers(&self, req: request::Headers) -> Vec<Bytes> {
@@ -95,16 +95,18 @@ impl<T: BlockChainClient + ?Sized> Provider for T {
 	}
 
 	fn block_bodies(&self, req: request::Bodies) -> Vec<Bytes> {
+		use ids::BlockID;
+
 		req.block_hashes.into_iter()
-			.map(|hash| self.block_body(hash.into()))
-			.map(|body| body.unwrap_or_else(|| EMPTY_LIST_RLP.into()))
+			.map(|hash| self.block_body(BlockID::Hash(hash)))
+			.map(|body| body.unwrap_or_else(|| EMPTY_LIST_RLP.to_vec()))
 			.collect()
 	}
 
 	fn receipts(&self, req: request::Receipts) -> Vec<Bytes> {
 		req.block_hashes.into_iter()
-			.map(|hash| self.block_receipts(&hash)
-			.map(|receipts| receips.unwrap_or_else(|| EMPTY_LIST_RLP.into()))
+			.map(|hash| self.block_receipts(&hash))
+			.map(|receipts| receipts.unwrap_or_else(|| EMPTY_LIST_RLP.to_vec()))
 			.collect()
 	}
 
@@ -112,12 +114,16 @@ impl<T: BlockChainClient + ?Sized> Provider for T {
 		unimplemented!()
 	}
 
-	fn code(&self, req: request::ContractCodes) -> Vec<Bytes>;
+	fn code(&self, req: request::ContractCodes) -> Vec<Bytes> {
+		unimplemented!()
+	}
 
 	fn header_proofs(&self, req: request::HeaderProofs) -> Vec<Bytes> {
 		// TODO: [rob] implement CHT stuff on `ethcore` side.
-		req.requests.into_iter().map(|_| EMPTY_LIST_RLP.into()).collect()
+		req.requests.into_iter().map(|_| EMPTY_LIST_RLP.to_vec()).collect()
 	}
 
-	fn pending_transactions(&self) -> Vec<SignedTransaction>;
+	fn pending_transactions(&self) -> Vec<SignedTransaction> {
+		unimplemented!()
+	}
 }
\ No newline at end of file
diff --git a/ethcore/src/light/request.rs b/ethcore/src/types/les_request.rs
similarity index 80%
rename from ethcore/src/light/request.rs
rename to ethcore/src/types/les_request.rs
index f043f0f25..e947c654d 100644
--- a/ethcore/src/light/request.rs
+++ b/ethcore/src/types/les_request.rs
@@ -16,15 +16,16 @@
 
 //! LES request types.
 
-// TODO: make IPC compatible.
-
 use util::H256;
 
 /// A request for block headers.
-#[derive(Debug, Clone, PartialEq, Eq)]
+#[derive(Debug, Clone, PartialEq, Eq, Binary)]
 pub struct Headers {
-	/// Block information for the request being made.
-	pub block: (u64, H256),
+	/// Starting block number
+	pub block_num: u64,
+	/// Starting block hash. This and number could be combined but IPC codegen is
+	/// not robust enough to support it.
+	pub block_hash: H256,
 	/// The maximum amount of headers which can be returned.
 	pub max: usize,
 	/// The amount of headers to skip between each response entry.
@@ -34,7 +35,7 @@ pub struct Headers {
 }
 
 /// A request for specific block bodies.
-#[derive(Debug, Clone, PartialEq, Eq)]
+#[derive(Debug, Clone, PartialEq, Eq, Binary)]
 pub struct Bodies {
 	/// Hashes which bodies are being requested for.
 	pub block_hashes: Vec<H256>
@@ -44,14 +45,14 @@ pub struct Bodies {
 ///
 /// This request is answered with a list of transaction receipts for each block
 /// requested.
-#[derive(Debug, Clone, PartialEq, Eq)]
+#[derive(Debug, Clone, PartialEq, Eq, Binary)]
 pub struct Receipts {
 	/// Block hashes to return receipts for.
 	pub block_hashes: Vec<H256>,
 }
 
 /// A request for a state proof
-#[derive(Debug, Clone, PartialEq, Eq)]
+#[derive(Debug, Clone, PartialEq, Eq, Binary)]
 pub struct StateProof {
 	/// Block hash to query state from.
 	pub block: H256,
@@ -65,21 +66,30 @@ pub struct StateProof {
 }
 
 /// A request for state proofs.
-#[derive(Debug, Clone, PartialEq, Eq)]
+#[derive(Debug, Clone, PartialEq, Eq, Binary)]
 pub struct StateProofs {
 	/// All the proof requests.
 	pub requests: Vec<StateProof>,
 }
 
 /// A request for contract code.
-#[derive(Debug, Clone, PartialEq, Eq)]
+#[derive(Debug, Clone, PartialEq, Eq, Binary)]
+pub struct ContractCode {
+	/// Block hash
+	pub block_hash: H256,
+	/// Account key (== sha3(address))
+	pub account_key: H256,
+}
+
+/// A request for contract code.
+#[derive(Debug, Clone, PartialEq, Eq, Binary)]
 pub struct ContractCodes {
 	/// Block hash and account key (== sha3(address)) pairs to fetch code for.
-	pub code_requests: Vec<(H256, H256)>,
+	pub code_requests: Vec<ContractCode>,
 }
 
 /// A request for a header proof from the Canonical Hash Trie.
-#[derive(Debug, Clone, PartialEq, Eq)]
+#[derive(Debug, Clone, PartialEq, Eq, Binary)]
 pub struct HeaderProof {
 	/// Number of the CHT.
 	pub cht_number: u64,
@@ -90,14 +100,14 @@ pub struct HeaderProof {
 }
 
 /// A request for header proofs from the CHT.
-#[derive(Debug, Clone, PartialEq, Eq)]
+#[derive(Debug, Clone, PartialEq, Eq, Binary)]
 pub struct HeaderProofs {
 	/// All the proof requests.
 	pub requests: Vec<HeaderProofs>,
 }
 
 /// Kinds of requests.
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Binary)]
 pub enum Kind {
 	/// Requesting headers.
 	Headers,
@@ -114,7 +124,7 @@ pub enum Kind {
 }
 
 /// Encompasses all possible types of requests in a single structure.
-#[derive(Debug, Clone, PartialEq, Eq)]
+#[derive(Debug, Clone, PartialEq, Eq, Binary)]
 pub enum Request {
 	/// Requesting headers.
 	Headers(Headers),
diff --git a/ethcore/src/types/mod.rs.in b/ethcore/src/types/mod.rs.in
index 6ef67009a..05c2c4dba 100644
--- a/ethcore/src/types/mod.rs.in
+++ b/ethcore/src/types/mod.rs.in
@@ -34,3 +34,5 @@ pub mod block_import_error;
 pub mod restoration_status;
 pub mod snapshot_manifest;
 pub mod mode;
+pub mod pruning_info;
+pub mod les_request;
\ No newline at end of file
diff --git a/ethcore/src/types/pruning_info.rs b/ethcore/src/types/pruning_info.rs
index c49b7825b..40564f488 100644
--- a/ethcore/src/types/pruning_info.rs
+++ b/ethcore/src/types/pruning_info.rs
@@ -24,7 +24,7 @@
 #[derive(Debug, Clone, Binary)]
 pub struct PruningInfo {
 	/// The first block which everything can be served after.
-	pub earliest_chain: u64
+	pub earliest_chain: u64,
 	/// The first block where state requests may be served.
-	pub earliest_state: u64
+	pub earliest_state: u64,
 }
\ No newline at end of file