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Distributing Address Selection Policy Using DHCPv6
RFC 7078

Internet Engineering Task Force (IETF)                      A. Matsumoto
Request for Comments: 7078                                   T. Fujisaki
Category: Standards Track                                            NTT
ISSN: 2070-1721                                                 T. Chown
                                               University of Southampton
                                                            January 2014

           Distributing Address Selection Policy Using DHCPv6

Abstract

   RFC 6724 defines default address selection mechanisms for IPv6 that
   allow nodes to select an appropriate address when faced with multiple
   source and/or destination addresses to choose between.  RFC 6724
   allows 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 parameters and policy table, and thus
   allowing the administrator to control the address selection behavior
   of nodes in their site.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc7078.

Copyright Notice

   Copyright (c) 2014 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

Matsumoto, et al.            Standards Track                    [Page 1]
RFC 7078           DHCPv6 Address Selection Policy Opt      January 2014

   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.

   This document may contain material from IETF Documents or IETF
   Contributions published or made publicly available before November
   10, 2008.  The person(s) controlling the copyright in some of this
   material may not have granted the IETF Trust the right to allow
   modifications of such material outside the IETF Standards Process.
   Without obtaining an adequate license from the person(s) controlling
   the copyright in such materials, this document may not be modified
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   not be created outside the IETF Standards Process, except to format
   it for publication as an RFC or to translate it into languages other
   than English.

1.  Introduction

   [RFC6724] 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.  This specification
   defines a new DHCPv6 option for configuring the default policy table.

   Some problems were identified with the default address selection
   policy as originally defined in [RFC3484].  As a result, RFC 3484 was
   updated and obsoleted by [RFC6724].  While this update corrected a
   number of issues identified from operational experience, 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 [ADDR-SEL].  Those
   documents have helped shape the improvements in the default address
   selection algorithm in [RFC6724] as well as the requirements for the
   DHCPv6 option defined in this specification.

   This option's concept is to serve as a hint for a node about how to
   behave in the network.  Ultimately, while the node's administrator
   can control how to deal with the received policy information, the
   implementation SHOULD follow the method described below uniformly to
   ease troubleshooting and to reduce operational costs.

1.1.  Conventions Used in This Document

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",

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