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ICMP Router Discovery Messages (RFC1256)

IP.com Disclosure Number: IPCOM000002073D
Original Publication Date: 1991-Sep-01
Included in the Prior Art Database: 2000-Sep-12
Document File: 16 page(s) / 41K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

S. Deering: AUTHOR

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.

This text was extracted from a ASCII Text document.
This is the abbreviated version, containing approximately 7% of the total text.

Network Working Group S. Deering, Editor

Request for Comments: 1256 Xerox PARC

September 1991

ICMP Router Discovery Messages

Status of this Memo

This RFC specifies an IAB standards track protocol for the Internet

community, and requests discussion and suggestions for improvements.

Please refer to the current edition of the "IAB Official Protocol

Standards" for the standardization state and status of this protocol.

This document is a product of the IETF Router Discovery Working

Group. Distribution of this memo is unlimited.

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.

Table of Contents

1. Terminology 1

2. Protocol Overview 3

3. Message Formats 5

4. Router Specification 7

4.1. Router Configuration Variables 7

4.2. Message Validation by Routers 9

4.3. Router Behavior 9

5. Host Specification 12

5.1. Host Configuration Variables 12

5.2. Message Validation by Hosts 13

5.3. Host Behavior 14

6. Protocol Constants 17

7. Security Considerations 17

References 18

Author's Address 19

1. Terminology

The following terms have a precise meaning when used in this

document:

system a device that implements the Internet Protocol, IP [9].

router a system that forwards IP datagrams, as specified

in [2]. This does not include systems that, though

capable of IP forwarding, have that capability turned

off. Nor does it include systems that do IP forwarding

only insofar as required to obey IP Source Route

options.

host any system that is not a router.

multicast unless otherwise qualified, means the use of either IP

multicast [4] or IP broadcast [6] service.

link a communication facility or medium over which systems

can communicate at the link layer, i.e., the protocol

layer immediately below IP. The term "physical

network" has sometimes been used (imprecisely) for

this. Ex...