[dns-operations] Missing .us and GTLD records??

Paul Vixie vixie at isc.org
Fri May 21 05:17:38 UTC 2010

> Date: Thu, 20 May 2010 23:38:45 -0400 (EDT)
> From: Luis Uribarri <uribarri at alum.mit.edu>
> Yes, if there is a transport problem, then a dual stack resolver will have
> issues talking to a dual stack authoritative server, but it will not be
> compleately unable to talk to such authoritative server because of the
> availability of IPv4 on both the resolver and such authoritative server.

so you've got a resolver that behaves differently when some nameservers are
multihomed and some are not? i'd like to learn more about this, plz explain.
the only thing a resolver is SUPPOSED to do differently when encountering a
multihomed server is propagate SERVFAIL to the other addresses of that name
server, effectively poisoning all addresses for a "nameserver name" when it
finds a zone unresolvable there. you seem to think that your resolver is not
following RFC 1034/1035. what resolver is this? a correctly implemented
resolver will not give poorer performance for a singly home nameserver than
for a multihomed one, where all addresses for that nameserver give timeouts.
(timeout isn't propagated, so, the addresses aren't even considered related
except in the case where one of them returns SERVFAIL.)

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