Re: Comments on draft-wbeebee-ipv6-cpe-router-01.txt

["Ole Troan" <otroan@employees.org>]

> What is the reason for this prohibition?

let me see if I can recall the arguments at the time:

- the model of prefix delegation in 3633 is strictly hierarchical and
you delegate a prefix typically across an administrative boundary
  the upstream link (link between RR and DR) is managed by the DR
- there are already two mechanisms for address assignment, PD is for
prefix delegation not address assignment. if the delegated prefix
  was subnetted also on the upstream, would the RR send RA's for example?
- the DR will consider the prefix off-link and not use ND for address
resolution, while the RR thinks the prefix is on-link.

what problem are you trying to solve? if you wish to avoid using a
separate /64 for the upstream link, then there is a solution for that
in the draft I believe. (no global address on the upstream link, use
of a loopback interface with an address from the delegated prefix for
management purposes).

cheers,
Ole

>> It does help us if you can point to text in RFC3633 that prohibits the
> behavior that is being asked by some DSL folks.
>>
>
> section 12.1:
>
>   Upon the receipt of a valid Reply message, for each IA_PD the
>   requesting router assigns a subnet from each of the delegated
>   prefixes to each of the links to which the associated interfaces are
>   attached, with the following exception: the requesting router MUST
>   NOT assign any delegated prefixes or subnets from the delegated
>   prefix(es) to the link through which it received the DHCP message
>   from the delegating router.
>
> /ot
>
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