Reverse DNS


S

Self

Hi there - Emails sent from our domain to certain
external domains is being rejected because we have no
reverse DNS lookup configured.

We are hosting DNS for our internal network (WIN2K
domain, AD integrated and we have a firewall using NAT)
and our webhosting facility is our hosting our external
NS records.

How do we get a reverse DNS record for our domain? Do we
configure that on the inside or does our webhosting
facilitly do that? If so, how?

Oh, by the way - AT&T is our service provider and we
don't have them administering DNS for us either primary
of secondary.

Any and all help is appreciated.

Thanks

C.
 
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J

J.C. Hornbeck [MSFT]

If your web hosting company is hosting your external DNS name space then
they're the ones who are going to have to fix this. Just contact them and
tell them what your problem is and they should know what you're talking
about.

--
J.C. Hornbeck, MCSE
Microsoft Product Support

NOTE: Please reply to the newsgroup and not directly to me. This allows
others to add to and benefit from these threads and also helps to ensure a
more timely response. Thank you!

This posting is provided "AS IS" without warranty either expressed or
implied, including, but not limited to, the implied warranties of
merchantability or fitness for a particular purpose.
 
K

Kevin D. Goodknecht [MVP]

In
Self said:
Hi there - Emails sent from our domain to certain
external domains is being rejected because we have no
reverse DNS lookup configured.

We are hosting DNS for our internal network (WIN2K
domain, AD integrated and we have a firewall using NAT)
and our webhosting facility is our hosting our external
NS records.

How do we get a reverse DNS record for our domain? Do we
configure that on the inside or does our webhosting
facilitly do that? If so, how?

Oh, by the way - AT&T is our service provider and we
don't have them administering DNS for us either primary
of secondary.

Any and all help is appreciated.

Thanks

C.
Your ISP is responsible for the reverse lookup because unless they delegate
the reverse lookup to another DNS server, they still own the IP addresses.
 
M

microsoft

your ISP deals with reverse dns lookups... just call them up and they can
post up your external IP... be careful publishing your exchange external
address... you might get slammed with spam.
 
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J

John Coutts

Hi there - Emails sent from our domain to certain
external domains is being rejected because we have no
reverse DNS lookup configured.

We are hosting DNS for our internal network (WIN2K
domain, AD integrated and we have a firewall using NAT)
and our webhosting facility is our hosting our external
NS records.

How do we get a reverse DNS record for our domain? Do we
configure that on the inside or does our webhosting
facilitly do that? If so, how?

Oh, by the way - AT&T is our service provider and we
don't have them administering DNS for us either primary
of secondary.

Any and all help is appreciated.

Thanks

C.
************************ REPLY SEPARATER ************************
If you wish to supply your own reverse lookup, it must be delagated to you from
above. It is a top down approach. Generally speaking, ISP's do not want to sub
delegate a few IP addresses because it is not a straight forward process. It is
designed to work on "C" class networks. Therefore, unless you have an an ISP
that is willing to sub-delegate, you are stuck with the ISP providing the
reverse lookup.
 

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