RFC 1256 · PROPOSED STANDARD · 1991
SUN · 14 JUN 2026
ICMP Router Discovery Messages
Overview
RFC 1256, “ICMP Router Discovery Messages”, is a Proposed Standard document published in September 1991 by S. Deering. The canonical text is published by the RFC Editor.
Abstract
This document specifies an extension of the Internet Control Message Protocol (ICMP) to enable hosts attached to multicast or broadcast networks to discover the IP addresses of their neighboring routers. [STANDARDS-TRACK]
What “Proposed Standard” means
An entry-level standards-track specification: stable, peer-reviewed and a solid basis for implementation, though it may still evolve before becoming an Internet Standard.
Read this RFC
The canonical text of RFC 1256 is hosted at rfc-editor.org. Available in TXT,HTML.
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