Distributing Address Selection Policy using DHCPv6

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Document Type Active Internet-Draft (6man WG)
Last updated 2013-09-20
Replaces draft-fujisaki-6man-addr-select-opt
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6man Working Group                                          A. Matsumoto
Internet-Draft                                               T. Fujisaki
Intended status: Standards Track                                     NTT
Expires: March 25, 2014                                         T. Chown
                                               University of Southampton
                                                      September 21, 2013

           Distributing Address Selection Policy using DHCPv6


   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 to
   control the address selection behavior of nodes in their site.

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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 identifed 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
   [I-D.ietf-6man-addr-select-considerations].  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

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