> On Oct 11, 2019, at 2:21 PM, Paul Vixie <p...@redbarn.org> wrote: > > i think there are 13 names each having an A and an AAAA. so, 26 candidate > addresses. most resolvers will try them all and home in on the one with the > lowest RTT. if one of the 13 it tries via IPv6 doesn't answer, it won't > affect operations. in fact, one or more are unreachable from random places > almost always, and the system is designed with that in mind. (for example, > the use of UDP means unreliability is in-scope.)
Fair enough, and I don't have much "standing" in this case, my server prefers IPv4, and I have a slave copy of both the root and arpa zones... I still feel (on behalf of others) that the situation is unfortunate, though of course by no means dire. There are likely more noticeable consequences for some users than C-root unreachability, where the work-around isn't just an occasional rare short lookup delay. -- Viktor. _______________________________________________ dns-operations mailing list dns-operations@lists.dns-oarc.net https://lists.dns-oarc.net/mailman/listinfo/dns-operations