6man Working Group A. Matsumoto
Internet-Draft T. Fujisaki
Intended status: Standards Track NTT
Expires: April 12, 2014 T. Chown
University of Southampton
October 09, 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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[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