Default Address Selection for Internet Protocol version 6 (IPv6)
draft-ietf-6man-rfc3484bis-04

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Last updated 2012-05-30 (latest revision 2012-05-15)
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Network Working Group                                     D. Thaler, Ed.
Internet-Draft                                                 Microsoft
Obsoletes: 3484 (if approved)                                  R. Draves
Intended status: Standards Track                      Microsoft Research
Expires: November 16, 2012                                  A. Matsumoto
                                                                     NTT
                                                                T. Chown
                                               University of Southampton
                                                            May 15, 2012

    Default Address Selection for Internet Protocol version 6 (IPv6)
                   draft-ietf-6man-rfc3484bis-04.txt

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.  This
   document obsoletes RFC 3484.

Status of this Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
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   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

Thaler, et al.          Expires November 16, 2012               [Page 1]
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   This Internet-Draft will expire on November 16, 2012.

Copyright Notice

   Copyright (c) 2012 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

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Internet-Draft     Default Address Selection for IPv6           May 2012

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4
     1.1.  Conventions Used in This Document  . . . . . . . . . . . .  5
   2.  Context in Which the Algorithms Operate  . . . . . . . . . . .  5
     2.1.  Policy Table . . . . . . . . . . . . . . . . . . . . . . .  7
     2.2.  Common Prefix Length . . . . . . . . . . . . . . . . . . .  8
   3.  Address Properties . . . . . . . . . . . . . . . . . . . . . .  8
     3.1.  Scope Comparisons  . . . . . . . . . . . . . . . . . . . .  8
     3.2.  IPv4 Addresses and IPv4-Mapped Addresses . . . . . . . . .  9
     3.3.  Other IPv6 Addresses with Embedded IPv4 Addresses  . . . .  9
     3.4.  IPv6 Loopback Address and Other Format Prefixes  . . . . .  9
     3.5.  Mobility Addresses . . . . . . . . . . . . . . . . . . . . 10
   4.  Candidate Source Addresses . . . . . . . . . . . . . . . . . . 10
   5.  Source Address Selection . . . . . . . . . . . . . . . . . . . 11
   6.  Destination Address Selection  . . . . . . . . . . . . . . . . 14
   7.  Interactions with Routing  . . . . . . . . . . . . . . . . . . 16
   8.  Implementation Considerations  . . . . . . . . . . . . . . . . 16
   9.  Security Considerations  . . . . . . . . . . . . . . . . . . . 17
   10. Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
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