Re: Guidelines for Numbering IPv6 Point-to-Point Links and Easing the Addressing Plans

[Ole Troan <ot@cisco.com>]

>> using the first (or any) subnet of a larger prefix, breaks the
>> conceptual model of DHCP prefix delegation. the prefix is delegated to
>> the requesting router and cannot be used to number the link between
>> the delegating and requesting router.
>
> I just re-read the DHCP-PD document, and is not so clear to me that this
> breaks the model (I mean strictly there is no any text that is against this
> usage). Also, we have actually tested this, even with Cisco, and it works
> ;-)
>
> If you mean that DHCP-PD concept is to delegate the complete prefix to the
> requesting router, well, the user owning the CPE will not complain having
> one less /64, but also is not so clear to me that we are stealing from them
> a /64 because this is actually used to connect it ;-)

how is the requesting router supposed to know that it can't use that
prefix on a downstream link?

cheers,
Ole