Reverse DNS not working for new server

Stephen John Smoogen smooge at
Mon Nov 27 03:01:57 UTC 2006

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"

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