> -----Original Message----- > From: ietf-bounces@xxxxxxxx [mailto:ietf-bounces@xxxxxxxx] On > Behalf Of Sabahattin Gucukoglu > Sent: Thursday, June 17, 2010 4:38 AM > To: ietf@xxxxxxxx > Subject: The IPv6 Transitional Preference Problem > > Just in case someone here wants to take sides, have a look at > this thread on the IPv6 discussion list at Apple: > http://lists.apple.com/archives/ipv6-dev/2010/Jun/msg00000.html > (the thread actually goes back earlier than that, but I can't > be bothered going looking for it because I can't stand that > awful PiperMail interface) > > Summary: it is a problem for some people, notably content > providers, that connectivity losses result from a preference > to use (advertised) v6 routes. Mac OS X, in particular, has > this habit of treating even the commonplace 6to4 routes, > which of course fail occasionally for a number of reasons, > just as native IPv6, and preferring them. It has no address > selection table, so it will flunk even when IPv4 would have > worked fine, i.e., will not treat common v4-NAT environment > as global scope. > > My take: it's not their fault. Transition mechanisms must > improve, because they're needed even into the IPv4 twilight. > However, it's been noted before that an API for selection of > the protocol based on application requirements is a solution > to this particular paradox, and I agree with that. My take: fix it in the delay-sensitive applications. That means Safari, Firefox, IE, etc., as we describe in "Happy Eyeballs", http://tools.ietf.org/html/draft-wing-http-new-tech-00 which effectively says: tend to prefer IPv6 (or IPv4) as long as IPv6 (or IPv4) is working well. If it's a new network connection, try both at the same time (because the host does not yet know which will work well). -d > Cheers, > Sabahattin > _______________________________________________ > Ietf mailing list > Ietf@xxxxxxxx > https://www.ietf.org/mailman/listinfo/ietf _______________________________________________ Ietf mailing list Ietf@xxxxxxxx https://www.ietf.org/mailman/listinfo/ietf