Why would BIND timeout on only 'A' results?

Dave Clark bind-users at dollardns.net
Fri Aug 12 21:21:25 UTC 2005


Check out this strangeness.  Keep in mind I am not the owner of this domain.
I'm just helping this guy with diagnosing the problem with his dns server:

dig cawunited.com (times out)
http://www.dollardns.net/cgi-bin/dnscrawler/index.pl?name=cawunited.com&lr=6&submit=BU

dig cawunited.com any (works)
http://www.dollardns.net/cgi-bin/dnscrawler/index.pl?name=cawunited.com&type=ANY&lr=6&submit=BU

dig +tcp @67.171.102.148 cawunited.com (also works)
http://www.dollardns.net/cgi-bin/dnscrawler/index.pl?name=cawunited.com&proto=tcp&lr=6&submit=BU

dig ns1.cawunited.com (times out)
http://www.dollardns.net/cgi-bin/dnscrawler/index.pl?name=ns1.cawunited.com&type=A&lr=6&submit=BU

dig ns1.cawunited.com any (still times out cause there are only A records)
http://www.dollardns.net/cgi-bin/dnscrawler/index.pl?name=ns1.cawunited.com&type=ANY&lr=6&submit=BU

dig @67.171.102.148 www.cawunited.com (works cause there's a cname)
http://www.dollardns.net/cgi-bin/dnscrawler/index.pl?name=www.cawunited.com&lr=6&submit=BU

dig @67.171.102.148 version.bind txt ch (latest bind)
http://www.dollardns.net/cgi-bin/dnscrawler/index.pl?server=67.171.102.148&name=version.bind&type=TXT&class=CH&lr=6&submit=BU

So the server times out when the response consists of nothing but 'A'
records, only if UDP is used.

Now, maybe it isn't BIND's fault.  Maybe there is an intermediate gateway or
router that is specifically blocking these kinds of responses, but that
would be very strange.  Looking for ideas on the explanation.

Dave Clark



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