On Nov 15, 2011, at 10:52 AM 11/15/11, Ted Lemon wrote:

> On Nov 15, 2011, at 10:44 AM, Brian E Carpenter <[email protected]> 
> wrote:
>> The mic line was too long to bring this up:
>> You suggest using RFC 3633. How about RFC 2894 (Router renumbering) too?
>> Typo: the draft actually cites RFC 3363, which is not what you intended...
> 
> Ditto on the mic line—very frustrating.   I think you overestimate the 
> obstacles to using DHCPv6 PD for this application.   I don't think any 
> protocol extension is required.   What is needed is ad-hoc relay 
> configuration, which is already anticipated.   The CPE device can just 
> allocate a /64 for any PD it receives, and with ad-hoc relaying, it should 
> all Just Work.

Yup.  No protocol extensions needed to DHCPv6.  Needs some careful thinking 
about how to use RAs as the trigger for deciding when a prefix is needed.

> The way ad hoc relaying works is that when you come up, your PD client asks 
> for a prefix on its upstream port.   If it receives PDs, it relays them on 
> its upstream port.   These PDs all wind up at the CPE device, which allocates 
> /64s to them and forwards them back, all in accordance with the existing DHCP 
> relay mechanism.
> 
> I think homenet would have to do a draft describing how to set this up, but 
> it does not require a DHCP extension.   There'd be some details to document 
> on how the routing topology gets set up; perhaps that could be done with OSPF.

Also might need a little thinking about how to accommodate multi-homed 
networks; e.g., allow the requesting router to take a prefix from each of the 
delegating routers it hears from (as opposed to the address assignment strategy 
of choosing one DHCP server to interact with).

- Ralph


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