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