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Reverse DNS w/5 octet numbers..

From: thomas sulentic
Date: Tuesday, January 25, 2005
Time: 7:28:06 am

Hello -

Recently I was asked to help out with a particular problem a colleague was
having in regards to a time out problem they were having with an in-house
mail server..

Turns out it had to do with a reverse record that was using a 5 octet number
instead of the usual 4.. Something I have never come across..

Is a 5 octet reverse new/old or something proprietary with their (PacBell)
DNS servers?? The regular host file only contains a 4 octet IP number
scheme.

What was strange about this case was that nobody in PacBell was able to
figure out what was up. Evidently, they went to this 5 octet number scheme
w/o telling any of the tech support people..

A 'quick fix' stumbled upon was to include 2 reverse zones.. One for the 4
octet and one for the 5.. Very very odd..

AND - even though the IP block was delegated to the client, and his
master/slave DNS servers were his own, as registered by Netsol, he HAD to
have the reverse managed by PacBell - if he wanted to avoid this time out
problem..

PacBell says it for security.. Does this sound like something ordinary or
out of the ordinary??

Im asking this for future reference when down the road I/we are faced with a
similar problem..

Regards,
Thomas Sulentic
ZooAchtiv





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