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gh-148 adding devp2p to side bar and setting up devp2p page
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| # Execution p2p | ||
| # DevP2P | ||
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| > :warning: This article is a [stub](https://en.wikipedia.org/wiki/Wikipedia:Stub), help the wiki by [contributing](/contributing.md) and expanding it. | ||
| This section will cover the networking protocol used by the Execution Layer (EL). | ||
| First, we will provide some background on computer networks and then we will dive into the | ||
| specifics of the EL's networking protocol. | ||
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| The execution layer implements [devp2p](https://github.com/ethereum/devp2p) as its communication protocol with nodes in the network. It includes various subprotocols and features: eth, snap, les, pip, wit. | ||
| ## Computer networks background | ||
| * Distributed network of nodes | ||
| * OSI vs TCP/IP model | ||
| ## EL's networking specs | ||
| * peer-to-peer networking protocol | ||
| * gossiping data (1:N) and request/response (1:1) communication | ||
| * Client software divided into Execution and Consensus (each one have its own p2p network) | ||
| * Execution network propagates transactions | ||
| * Two network stacks: | ||
| * UDP-based transport layer (discovery and finding peers) | ||
| * TCP-based transport layer (devp2p, exchange information) | ||
| * Discovery protocol | ||
| * bootstrap nodes | ||
| * Kademlia | ||
| * Hash tables | ||
| * PING/PONG hashed messages | ||
| * Find neighbours: list of peers | ||
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| Because libp2p (used by CL) was not ready when Ethereum was created, devp2p was created as Ethereum's own p2p protocol stack. | ||
| start client --> connect to bootnode --> bond to bootnode --> find neighbours --> bond to neighbours | ||
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| ## ENR: Ethereum Node Records | ||
| * Node's identity | ||
| * Object | ||
| * signature (hash) | ||
| * sequence number | ||
| * arbitrary key-value pairs | ||
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| ## DevP2P specs | ||
| * RLPx: encrypted and authenticated transport protocol | ||
| * Handshake messaging | ||
| * Encryption | ||
| * Authentication | ||
| * RLP: Recursive Length Prefix encoding | ||
| * Multiplexing: multiple subprotocols | ||
| * Subprotocols | ||
| * LES: Light Ethereum Subprotocol | ||
| * Witness Subprotocol | ||
| * Wire Subprotocol | ||
| * SHH: Whisper Subprotocol | ||
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| ### Further Reading | ||
| * [Geth devp2p docs](https://geth.ethereum.org/docs/tools/devp2p) | ||
| * [Ethereum devp2p GitHub](https://github.com/ethereum/devp2p) |