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Reverse DNS Sub-net folders being automatically created

Posted on 2009-07-13
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Last Modified: 2012-05-07
I'm working on a joint project with another vendor and we've found a customer's DNS to be a little strange.  The forward lookup zones are all correct - but the reverse lookup zones are dynamically creating subfolders beneath the defined zone (see attached picture).

For example, the reverse lookup zone was created for 10.2.x.x.  Underneath that zone, folders for 10.2.1.x, 10.2.2.x, 10.2.3.x, etc are being created presumably by Windows.  The customer says they did nothing special when setting up the zones.

Everything seems to be working correctly so I'm of the mind-set that this isn't a problem but the other vendor remains convinced that it is.  I will agree it's not what I normally expected to see.  But then again, I haven't seen a lot of reverse DNS zones using Class B addressing schemes either.

Has anyone ever run across this?  And, if so, is it an indication that there's a problem somewhere with DNS setup?  The customer does maintain that all the subfolders have been created dynamically by DDNS.

Thanks.

DNSPTR.JPG
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Question by:trturner123
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oBdA earned 500 total points
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There's no problem here.
The behavior of Windows DNS when it comes to reverse lookup zones depends on how the zone was created.
You can either fill out all three octetts in the "Create reverse lookup zone" wizard, in which case a forward lookup zone just for this subnet will be created.
If you you fill out only the first two octetts, leaving the third one empty(!), Windows will create a forward lookup zone like you see above, and domains for the subnets under this will be automatically created.
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by:trturner123
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Thanks.  That was my feeling as well since they've never had any issues with DNS.  But it's good having that feeling verified.
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