Had a strange problem where our servers couldn't resolve hosts in an AD
subdomain.
This was in the zone file:
$ORIGIN foo.example.com.
...
ads NS ads.foo.example.com
...
...
...
ads A a.b.c.d
...
...
...
They said if you used their ADS for lookups, things worked...except they can't
resolve anything else using it. (there appears to be a problem with DNS
interference from their firewall.) Plus, if it worked...they wouldn't be able
to resolve hosts in our internal view.... But, they can't resolve hosts in
their ADS domain using our DNS.
It's not clear where the users are w.r.t. this firewall. But, since we can
reproduce the issue...guessing outside....its probably a datacenter firewall
rather than the department.
So, got the NS changed...though they said the way it was done is how Microsoft
says their supposed to do it.
Evidently... on their side it resolves ads.foo.example.com resolves to
a.b.c.d
a.b.c.e - dc2
a.b.c.f - dc3
So changing to:
$ORIGIN foo.example.com
...
ads NS dc2.foo.example.com.
NS dc3.foo.example.com.
dc2 A a.b.c.e
dc3 A a.b.c.f
...
Still doesn't work....'dig +trace ads.foo.example.com' worked, but 'dig
ads.foo.example.com' doesn't....and 'dig +trace host.ads.foo.example.com'
appears to work, but 'dig host.ads.foo.example.com' doesn't. Meanwhile
somebody else happened to be doing a network capture, and they see
dc2.foo.example.com replying to our caching dns servers, but the dns servers
aren't answering.
I then notice that the dig responses aren't authoritative.
How do you have an AD domain where your AD servers aren't authoritative for
itself?
I assume that's the problem now...or is there something else on my end that I
should be looking at?
Meanwhile....if things do start working....the 'host.foo.example.com' that
started this problem will resolve to a 10.b.c.d address. Which is another
problem I've been trying to quash...
--
Who: Lawrence K. Chen, P.Eng. - W0LKC - Senior Unix Systems Administrator
For: Enterprise Server Technologies (EST) -- & SafeZone Ally
Snail: Computing and Telecommunications Services (CTS)
Kansas State University, 109 East Stadium, Manhattan, KS 66506-3102
Phone: (785) 532-4916 - Fax: (785) 532-3515 - Email: lkc...@ksu.edu
Web: http://www-personal.ksu.edu/~lkchen - Where: 11 Hale Library
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