Re: address selection and DHCPv6

[James Carlson <james.d.carlson at sun.com>]

Vlad Yasevich writes:
> Also, this preference really depends on the usage cases.  I can see
> scenarios, where I would rather use autoconfigured address over the DHCP
> or manually assigned one.

Can you describe these?

> The concern I have is someone else may find the above preference backwards
> and may want to always prefer autoconf addresses over DHCP or statically
> configured.  This is a policy matter and you are proposing to encode it
> into the rules without ability to change.

Yes, that is indeed a concern.  It looks like it's actually a concern
with the existing rule set, as there's no guarantee that (say) best
prefix match is what the user really wanted.

> The rule set are basic postulates that enable best available communication.
> As an additonal step, the policy table is provided that allows for specific
> preferences.  Is it flexible enough for you want?

The policy table is searched by prefix match, so I don't quite see how
that suffices unless administrators have the foresight to avoid both
stateless and stateful on the same prefix, and the policy table is
kept in sync with DHCPv6 allocation pools (via
draft-fujisaki-dhc-addr-select-opt-02.txt, I would assume).

I think it's that lack of foresight that may be part of the underlying
concern here.

-- 
James Carlson, KISS Network                    <james.d.carlson at sun.com>
Sun Microsystems / 1 Network Drive         71.232W   Vox +1 781 442 2084
MS UBUR02-212 / Burlington MA 01803-2757   42.496N   Fax +1 781 442 1677

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