Reverse DNS Lookup Problems

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Vladimir - 13 Apr 2004 17:34 GMT

Hi,

I need help on Reverse DNS Lookup.

Here's my scenario: I just found out that our domain has been listed on a
spam database. I need to remove it as soon as possible but I can't since the
PTR record for my IP Address is not pointing back to my domain name (remove
procedure requirements for this spam database). I contacted my ISP and they
don't want to make the proper PTR changes. I'm currently using DNS Servers
differents from my ISP (since they are a freakin pain when it comes to DNS)
so, when you query MYDOMAIN.COM you get my IP address but when you do a
Reverse DNS Lookup it doesn't point back to my domain or my DNS Servers.

I'm thinking on hosting my own DNS Servers and but I don't know much about
it. Either way I go, I need to update my PTR Record from my ISP but my
question is, If my ISP agree to make changes on my PTR Record, do I need to
do something to my DNS Servers?

I hope I was clear enough.

Thanks in Advance.

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Jonathan de Boyne Pollard - 13 Apr 2004 17:35 GMT

V> If my ISP agree to make changes on my PTR Record, do I need to
V> do something to my DNS Servers?

No.

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Scott Harding - MS MVP - 13 Apr 2004 20:57 GMT

Your ISP or whoever owns your IP's must be the ones to change this. This
should be a common procedure for them and there should be no reason why they
don't do this for you unless you are using a 'home' based ISP instead of a
'business' based one and you may doing things that they do not allow you to
do.

Signature

Scott Harding
MCSE, MCSA, A+, Network+
Microsoft MVP - Windows NT Server

> Hi,
>
[quoted text clipped - 17 lines]
>
> Thanks in Advance.

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Plasma - 19 Apr 2004 18:29 GMT

I had this same issue. The ISP who controls the IP address also did not
want to place a PTR record because they did not handle the domain. I was
able to talk them into a "reverse delegation" to the ISP who handles the
domain. That ISP then placed a PTR record pointing back to the IP address,
not their own.

To accomplish the reverse delegation, the first ISP will need two name
servers (hostname and IP address) of your hosting ISP. In my case, they
delegated my entire static address block. When someone does a reverse
lookup, it goes to your first ISP as they are associated with the IP
address. Then your first ISP announces the name server of your second ISP
who will have the PTR record. Works fine.

Post a way of reaching you if you need further details.

Mike in Ohio

> Hi,
>
[quoted text clipped - 17 lines]
>
> Thanks in Advance.

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