6man Working Group A.M. Matsumoto
Internet-Draft T.F. Fujisaki
Intended status: Standards Track NTT
Expires: November 01, 2013 T.C. Chown
University of Southampton
April 30, 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. The RFC 6724
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 parameters and policy table, and thus
control the address selection behavior of nodes in their site.
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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 6724, 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
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-considerations]. Those documents have
helped shape the improvements in the default address selection
algorithm [RFC6724] as well as the DHCPv6 option defined in this
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
document are to be interpreted as described in [RFC2119].