Re: [homenet] DHCP PD for homenets.

On Nov 7, 2012, at 10:46 AM 11/7/12, Ted Lemon wrote:

> I don't have a particular preference for DHCP-PD over OSPF in homenets, but I just wanted to quickly contradict what's been said by several people at the mic: that figuring out what prefix to delegate is hard.   It's not hard, actually—it's dead easy.   The reason folks think it's hard is because they're solving the wrong problem.
> 
> The problem that needs to be solved is how we number each home subnet.   The answer to this question is, "with a /64."   There is no other answer.   You never want to number a subnet with a /52.   Therefore, the delegating router should never delegate anything but a /64.   Problem solved.
> 
> I think the disconnect here is that people are thinking the routers to which prefixes are delegated need to themselves be delegating routers, but this is incorrect.   What they need to do is _relay_ prefix delegation requests to the delegating router from which they got their own delegation.
> 
> This scales to multi-homing with multiple delegating routers—you just relay every PD request upstream to all delegating routers.

+1; see my e-mail that passed this e-mail in flight.

> 
> I'd be happy to write a draft that describes how this works

draft-baker-homenet-prefix-assignment-01

> if someone actually wants it; I get the sense that people are pretty in love with the OSPF solution and would prefer not to be distracted, and I have no argument with that if that's the working group consensus.

- Ralph

> 
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