Distributing Address Selection Policy using DHCPv6
draft-ietf-6man-addr-select-opt-03

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Last updated 2012-02-21 (latest revision 2012-02-15)
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6man Working Group                                          A. Matsumoto
Internet-Draft                                               T. Fujisaki
Intended status: Standards Track                                 J. Kato
Expires: August 24, 2012                                             NTT
                                                                T. Chown
                                               University of Southampton
                                                       February 21, 2012

           Distributing Address Selection Policy using DHCPv6
                 draft-ietf-6man-addr-select-opt-03.txt

Abstract

   RFC 3484 defines default address selection mechanisms for IPv6 that
   allow nodes to select appropriate address when faced with multiple
   source and/or destination addresses to choose between.  The RFC 3484
   allowed for the future definition of methods to administratively
   configure the address selection policy information.  This document
   defines a new DHCPv6 option for such configuration, allowing a site
   administrator to distribute address selection policy overriding the
   default address selection policy table, and thus control the address
   selection behavior of nodes in their site.

Status of this Memo

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   This Internet-Draft will expire on August 24, 2012.

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   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

Matsumoto, et al.        Expires August 24, 2012                [Page 1]
Internet-Draft     DHCPv6 Address Selection Policy Opt     February 2012

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1.  Introduction

   RFC 3484 [RFC3484] describes default algorithms for selecting an
   address when a node has multiple destination and/or source addresses
   to choose from by using an address selection policy.  In Section 2 of
   RFC 3484, it is suggested that the default policy table may be
   administratively configured to suit the specific needs of a site.
   This specification defines a new DHCPv6 option for such
   configuration.

   Some problems have been identified with the default RFC 3484 address
   selection policy [RFC5220].  It is unlikely that any default policy
   will suit all scenarios, and thus mechanisms to control the source
   address selection policy will be necessary.  Requirements for those
   mechanisms are described in [RFC5221], while solutions are discussed
   in [I-D.ietf-6man-addr-select-sol] and
   [I-D.ietf-6man-addr-select-considerations].  Those documents have
   helped shape the improvements in the default address selection
   algorithm [I-D.ietf-6man-rfc3484-revise] as well as the DHCPv6 option
   defined in this specification.

1.1.  Conventions Used in This Document

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
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