... >> My second point is that assumptions like "the best path is through a >> prefix we both use" are silly. Analysis of a common traceroute will >> show that two random users tend to use two random ISPs. So a routing >> policy tat starts from "assume both users are using the same prefix" >> is a lost cause. Start from the assumption that you're looking for an >> address pair that works, and as a second choice, works well for a >> given ISP pair. > > I agree. Well, if you happen to have the same prefix, then it makes > sense. Also, in say an enterprise, most of the communication is probably > internal where this makes sense.
Sure, that was always clear to me - longest match only makes sense when you have already eliminated pretty much every other criterion. Longest match with other hosts under the same enterprise prefix is probably the best example. > But I agree that for most communication on the Internet, it is useless. > There are some other effects though (like preferring 2001 to reach 2001, > 2002 to reach 2002 etc) but there may be better ways of achieving that. I see the argument for 2002 but why 2001? It isn't special. Brian -------------------------------------------------------------------- IETF IPv6 working group mailing list ipv6@ietf.org Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 --------------------------------------------------------------------
