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Reverse Zones Lookups for a Disjointed Namespace?

Posted on 2007-04-06
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Last Modified: 2012-06-27
Hello, I am wondering if it is possible to do reverse lookups across two Windows domains that have a disjointed namespace?

For example, let's say client.domain1.com (192.168.1.x) needs to revolves a PTR record that exists on in a reverse zone domain2.com (1.10.10.in-addr.arpa).. Is there any way the DNS\DC (AD Integrated zone) for domain1.com could lookup a PTR record in domain2.com?

Thanks!

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Question by:Justin Durrant
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10 Comments
 
LVL 38

Expert Comment

by:Hypercat (Deb)
ID: 18865045
If you can resolve forward lookups between the domains, then you can resolve reverse lookups.  It shouldn't be any problem at all - are you having one?  Do you have a router providing a connection between the two domains?
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LVL 23

Author Comment

by:Justin Durrant
ID: 18865117
There is a router and connectivity between the domains. I am resolving forward zones just fine by using conditional forwarders. But this does not work for reverse lookups.

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LVL 38

Expert Comment

by:Hypercat (Deb)
ID: 18865202
What results do you get when you try a reverse lookup?  Are you sure the reverse lookup zone in domain2 is properly configured?
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LVL 23

Author Comment

by:Justin Durrant
ID: 18865285
the PTR records are not found... The zone is fine because clients in domain2 have no issues.
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LVL 38

Expert Comment

by:Hypercat (Deb)
ID: 18865490
So, forward lookup works fine but reverse lookup doesn't.  That's weird.  Is port 53 open for TCP as well as UDP? And are you sure you need it to work?  Do you have some application that won't work without it?
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LVL 23

Author Comment

by:Justin Durrant
ID: 18866208
Firewall ports are fine since my conditional forwarders work. Yes, Veritas Netback needs reverse. Current we are using HOSTS file on the NBU servers and it sucks! :)
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LVL 23

Author Comment

by:Justin Durrant
ID: 18889421
Any other suggestions?
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LVL 23

Author Comment

by:Justin Durrant
ID: 18952821
HELP!
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LVL 23

Author Comment

by:Justin Durrant
ID: 19055953
No one?
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LVL 38

Accepted Solution

by:
Hypercat (Deb) earned 2000 total points
ID: 19057540
JJ - did you ever try adding a static PTR entry in domain1 for the machines in domain2 that you need to resolve?  I guess you would have to add a new zone, but it might just work.  I've never heard of this, but it's worth a try, I figure...you can always delete it if it doesn't work or messes something else up.
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