Recent changes to UltraDNS, problems?
Mark Andrews
Mark_Andrews at isc.org
Tue Aug 24 01:31:07 UTC 2004
In article <412A8369.8000609 at inoc.net> you write:
>
>Has anyone else noticed any strange problems lately when querying
>UltraDNS for name server records?
>
>I have a few scripts that seem to have broken in the past week. A
>simple PERL script that looks up NS records from the root servers, which
>worked fine last week, suddenly starts reporting that the query is
>returning an empty answer.
>
>If I change it to any other TLD servers/domains, it works fine. What is
>even more strange is that when I use dig, the lookups are just fine.
>(most of the time) Can anyone at UltraDNS (or anyone else for that
>matter) shed some light on what might have changed/broken?
There is nothing wrong. The real NS records for the zone
can be found in the child zone. The UltraDNS servers are
returning a referral to them.
Also when you are querying authoritative only servers it
is a good idea to disable recursion.
Mark
; <<>> DiG 8.3 <<>> ns isc.org @TLD1.ULTRADNS.NET
; (1 server found)
;; res options: init recurs defnam dnsrch
;; got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 51679
;; flags: qr rd; QUERY: 1, ANSWER: 0, AUTHORITY: 2, ADDITIONAL: 1
;; QUERY SECTION:
;; isc.org, type = NS, class = IN
;; AUTHORITY SECTION:
isc.org. 1D IN NS ns1.gnac.com.
isc.org. 1D IN NS ns-ext.isc.org.
;; ADDITIONAL SECTION:
ns-ext.isc.org. 1D IN A 204.152.184.64
;; Total query time: 431 msec
;; FROM: drugs.dv.isc.org to SERVER: 204.74.112.1
;; WHEN: Tue Aug 24 11:28:40 2004
;; MSG SIZE sent: 25 rcvd: 95
>#!/usr/bin/perl
>
>use strict;
>use Net::DNS; #version 0.48
>
>my @tld = ("tld1.ultradns.net", "tld2.ultradns.net");
>my $res = Net::DNS::Resolver->new;
>$res->nameservers(@tld);
>
>my $query = $res->query("adaconline.org", "NS");
>if($query) {
> print "It worked!\n";
>} else {
> print "It failed!\n";
>}
>
>exit;
>
>
>
>In the above case the query always returns undef and the errorstring
>returned is no error. My initial thought was a bug in Net::DNS, but
>I've also heard from others they've started noticing strange lookup
>problems when asking UltraDNS directly for answers.
>
>--
>Robert Blayzor, BOFH
>INOC, LLC
>rblayzor at inoc.net
>PGP: http://www.inoc.net/~dev/
>Key fingerprint = 1E02 DABE F989 BC03 3DF5 0E93 8D02 9D0B CB1A A7B0
>
>Profanity is the one language all programmers know best.
>
More information about the NANOG
mailing list