Reverse DNS not working for new server

dhottinger at dhottinger at
Mon Nov 27 11:50:17 UTC 2006

I have a full class c.

Quoting Stephen John Smoogen <smooge at>:

> On 11/26/06, dhottinger at
> <dhottinger at> wrote:
>> I added a new webmail server several weeks ago.  I made the pert. DNS
>> entries to the zone file and the reverse lookup file.  Within my
>> domain using my DNS servers everything resolves correctly.  When I do
>> an nslookup for I get
>> However, outside my domain I get
>> UnKnown can't find Non-existent domain.  Now the rest
>> of my ip's resolve correctly.  Heres my zone file:
> I think it is because to the reverse DNS tree.. you don't own those ip
> addresses, but your ISP:Shentel Service Company  does. So when a
> reverse lookup occurs it is going to their DNS server:
> [dig +trace -x].
> Unless you have a Class C or your ISP is using classless reverse
> delegation, they will always maintain the reverse numbers as tracked
> by the outside world.
> --
> Stephen J Smoogen. -- CSIRT/Linux System Administrator
> How far that little candle throws his beams! So shines a good deed
> in a naughty world. = Shakespeare. "The Merchant of Venice"

Dwayne Hottinger
Network Administrator
Harrisonburg City Public Schools

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