>> While src-dest routing is certainly a solution - and an interesting >> one - it doesn't seem at all appropriate for an HNCP spec to assert >> that it is necessary.
> True. However, we were asked to describe the applicability, and > I consider e.g. tunneling solution inferior so I would rather not > propose that here. I was under the impression that there was consensus that tunnelling is a bad idea, and that source-specific routing is superior. I may be mis-reading Alia, but perhaps she means that some deployments might not require the added complexity of source-specific routing, and might be able to get away with ordinary next-hop routing. (Alia, apologies if I misunderstood.) Recall that our main concern is to ensure that Homenet routers from different vendors interoperate. Source-specific routing, when done right, interoperates with ordinary next-hop routing under the following conditions: (1) all edge routers are source-specific, (2) there is a connected backbone of source-specific routers, and (3) at least one of the routers in the backbone announces a non-specific default route. (1) and (3) are easy enough, but (2) is problematic: it is a global condition, one that can only be verified with global knowledge of the topology. So I agree with Markus -- while it might be possible to get away with a weaker requirement, it is way simpler to make source-specific routing a MUST. If there is market demand, we might want to write a different document that describes a weaker set of requirements for interior-only (non-gateway-capable) Homenet nodes. (A more desirable alternative, of course, would be to split the requirements in HNCP into HNCP requirements and Homenet requirements, but I gather that there's consensus that it's somewhat late to embark on such an ambitious project. I rather agree with that assessment -- we need to get Homenet out of the door quickly, lest people start deploying IPv6 NAT.) -- Juliusz _______________________________________________ homenet mailing list homenet@ietf.org https://www.ietf.org/mailman/listinfo/homenet
