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Preamble

EIP: 868
Title: Node Discovery v4 ENR Extension
Author: Felix Lange <fjl@ethereum.org>
Type: Standard Track
Category: Networking
Status: Draft
Created: 2018-02-02
Requires: EIP-8, EIP-778

Abstract

This EIP defines an extension to Node Discovery Protocol v4 to enable authoritative resolution of Ethereum Node Records (ENR).

Motivation

To bridge current and future discovery networks and to aid the implementation of other relay mechanisms for ENR such as DNS, we need a way to request the most up-to-date version of a node record.

Specification

Implementations of Node Discovery Protocol v4 should support two new packet types, a request and reply of the node record. The new packets are:

enrRequest (0x05)

RLP: [ expiration ]

When a packet of this type is received, the node should reply with an enrResponse packet containing the current version of its record.

To guard against amplification attacks, the sender of enrRequest should have replied to a ping packet recently. The expiration field, a UNIX timestamp, should be handled as for all other existing packets, i.e. no reply should be sent if it refers to a time in the past.

enrResponse (0x06)

RLP: [ requestHash, ENR ]

This packet is the response to enrRequest.

requestHash is the hash of the entire enrRequest packet being replied to.
ENR is the node record.

The recipient of the packet should verify that the node record is signed by node who sent enrResponse.

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