Subject: [sunset4] Distributing Address Selection Policy using DHCPv6

From: "George, Wes" <[email-masked]>
Date: Tue, 22 Jan 2013 12:12:38 -0500

The draft  draft-ietf-6man-addr-select-opt discusses a method to distribute address selection policies via DHCPv6 that potentially override the default RFC6724 policies.

http://tools.ietf.org/html/draft-ietf-6man-addr-select-opt-08

Since Sunset4 has been discussing the potential need to communicate not just address selection within IPv6, but also potentially between IPv4 and IPv6, it may be worth considering some additional functionality or use cases in this draft or as a companion draft to cover the milestone in the sunset4 charter about signaling end hosts to disable or depreference the use of IPv4. There is also the potential for other, more complex use cases to determine the proper preference for a given destination if and when an ISP is offering some combination of: Native IPv4, IPv4 + CGN, Native IPv6, IPv6 + DNS64/NAT64, etc. We don't necessarily have to make recommendations on what the preferences should be, but it may be useful to illustrate these problems in the draft and provide the framework to communicate more complex preferences based on the individual implementers' situation. It would also be helpful to be clear about the limitations of the complexity these options can realistically and scalably represent - it's unlikely that this can be used for very granular programming of an end host about which method to use for a large subset of distinct prefixes, so an upper bound might be appropriate.

Thanks,

Wes George

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