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Default Address Selection for Internet Protocol version 6 (IPv6) (RFC3484)

IP.com Disclosure Number: IPCOM000011548D
Original Publication Date: 2003-Feb-01
Included in the Prior Art Database: 2003-Mar-04
Document File: 25 page(s) / 55K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

R. Draves: AUTHOR

Abstract

This document describes two algorithms, for source address selection and for destination address selection. The algorithms specify default behavior for all Internet Protocol version 6 (IPv6) implementations. They do not override choices made by applications or upper-layer protocols, nor do they preclude the development of more advanced mechanisms for address selection. The two algorithms share a common context, including an optional mechanism for allowing administrators to provide policy that can override the default behavior. In dual stack implementations, the destination address selection algorithm can consider both IPv4 and IPv6 addresses - depending on the available source addresses, the algorithm might prefer IPv6 addresses over IPv4 addresses, or vice-versa.

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Network Working Group� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � R. Draves

Request for Comments: 3484� � � � � � � � � � � � � � � � � � � � � � � � � � � Microsoft Research

Category: Standards Track� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � February 2003

� � Default Address Selection for Internet Protocol version 6 (IPv6)

Status of this Memo

� � This document specifies an Internet standards track protocol for the

� � Internet community, and requests discussion and suggestions for

� � improvements.� Please refer to the current edition of the "Internet

� � Official Protocol Standards" (STD 1) for the standardization state

� � and status of this protocol.� Distribution of this memo is unlimited.

Copyright Notice

� � Copyright (C) The Internet Society (2003).� All Rights Reserved.

Abstract

� � This document describes two algorithms, for source address selection

� � and for destination address selection.� The algorithms specify

� � default behavior for all Internet Protocol version 6 (IPv6)

� � implementations.� They do not override choices made by applications

� � or upper-layer protocols, nor do they preclude the development of

� � more advanced mechanisms for address selection.� The two algorithms

� � share a common context, including an optional mechanism for allowing

� � administrators to provide policy that can override the default

� � behavior.� In dual stack implementations, the destination address

� � selection algorithm can consider both IPv4 and IPv6 addresses -

� � depending on the available source addresses, the algorithm might

� � prefer IPv6 addresses over IPv4 addresses, or vice-versa.

� � All IPv6 nodes, including both hosts and routers, must implement

� � default address selection as defined in this specification.

Draves� � � � � � � � � � � � � � � � � � � � � Standards Track� � � � � � � � � � � � � � � � � � � � [Page 1]

RFC 3484� � � � � � � � � � Default Address Selection for IPv6� � � � � February 2003

Table of Contents

� � 1.� � � Introduction................................................2

� � � � � � � � 1.1.� Conventions Used in This Document.....................4

� � 2.� � � Context in Which the Algorithms Operate.....................4

� � � � � � � � 2.1.� Policy Table..........................................5

� � � � � � � � 2.2.� Common Prefix Length..................................6

� � 3.� � � Address Properties..........................................6

� � � � � � � � 3.1.� Scope Comparisons.....................................7

� � � � � � � � 3.2.� IPv4 Addresses and IPv4-Mapped Addresses..............7

� � � � � � � � 3.3.� Other IPv6 Addresses with Embedded IPv4 Addresses.....8

� � � � � � � � 3.4.� IPv6 Loopback Address and Other Format Prefixes.......8

� � � � � � � � 3.5.� Mobility Addresses....................................8

� � 4.� � � Candidate Source Addresses..................................8

� � 5.� � � Source Address Selection........