On Wed, 7 Nov 2012, Andrew McGregor wrote:
But that's single-delegating-router, not recursive. The problem with recursive is figuring out what prefix length a sub-delegating router is going to ask for from its upstream. For a single-delegating-router setup, you just ask for either a bunch of /64s or something that just contains enough of those to cover all your downstream interfaces. In a recursive situation, you don't know what you will need further downstream.
For me, I've always taken for granted that the ISP CPE gets a /56 or something, and then it's fine to subdelegate /64s out of that as needed, and subdelegating routers request a /64 at a time as needed, and relay for sub-sub-delegating routers (as OP suggested).
The hard part is to get the source based routing to work so that packets flowing upstream exit via the correct ISP CPE (if the home is multihomed to multiple ISPs) depending on what source address they have, so as to avoid getting dropped by uRPF filters.
I'm surprised the subnet allocation size is still being discussed, I haven't followed the working group as closely as I should, but I hope we can get through this quickly.
-- Mikael Abrahamsson email: [email protected] _______________________________________________ homenet mailing list [email protected] https://www.ietf.org/mailman/listinfo/homenet
