Am 04.06.2011 15:26, schrieb der Mouse: >> [...] even if the pool client is going to use IPv6 for NTP, the DNS >> lookup will most certainly remain IPv4 for a foreseeable future (as >> the DNS is the last infrastructure that will migrate to IPv6). > > Migration is not an all-or-nothing thing. Like most services, the DNS > can _already_ operate over v6; a v6-connected client querying a > v6-connected nameserver can and not implausibly will happen over v6. > Like most services, it is already migrating piecemeal. > > Why would you expect anything else?
Recursive DNS servers *have* to support IPv4 at the moment, or else they can't do much useful things at the moment. This will actually continue until the majority of DNS servers supports IPv6 - even though there may be IPv6-only nodes much earlier, DNS servers will require IPv4 connectivity for a long time. By nearly the same rationale, authoritative servers will continue to require IPv4 connectivity for quite some time. So I stand by my claim: DNS servers will continue to use IPv4 for a long time. > A nameserver intended to provide service to the v4 net (like the pool > nameservers) will of course have to have a v4 address, but that's no > different from any other service. It certainly doesn't mean that > v6-connected clients will necessarily use v4 to query it. No, v6-connected stub resolvers will use their recursive resolve, which then, in turn, will use IPv4. > Indeed, as > v6-only hosts become more common, some won't be able to. (And, while > you may know this, some people probably don't: yes, they exist. They > have existed for at least some nine years; when I was in Tromsø back in > 2002, the house netlink provided by the university I was working for > was v6-only.) See above. Stub resolvers may become v6-only soon. Recursive resolvers will continue to require IPv4 addresses, and they may well be the *last* systems on the internet with IPv4 addresses. That's one of the reasons why the RIRs set aside their last /8 blocks, so that new ISPs can at least get 1024 addresses, for DNS, and perhaps mail servers (as well as HTTP proxies). Regards, Martin _______________________________________________ pool mailing list [email protected] http://lists.ntp.org/listinfo/pool
