Re: address selection and DHCPv6

[Julien Laganier <julien.IETF at laposte.net>]

Hi Vlad,

On Wednesday 25 October 2006 18:22, Vlad Yasevich 
wrote:
> > So, yes, there is a reason to prefer a configured 
> > address over a stateless autoconf one. Same
> > argument applies with DHCPv6 configured addresses. 
>
> [...]
> 
> 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. 
> 
> [...]
>
> 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.

Would privacy be the reason why such someone would 
prefer autoconf addresses over DHCP or statically 
configured addresses?

Would adding to the proposed new rule a statement 
similar to those of Source Address Selection Rule 4 
(Prefer home addresses) and 7 (Prefer public 
addresses) as below solve your concern?

Implementations SHOULD/MUST provide a mechanism 
allowing an application to reverse the sense of this 
preference [...] (e.g., via appropriate API 
extensions). Use of the mechanism should only affect 
the selection rules for the invoking application [...] 
Implementations for which [insert reason here] MAY 
reverse the sense of this rule [...]

Best,

--julien

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