Reserve look up problem Please help

[Mr555]

Hi everyone.

We been having e-mail problem send to priticular domain, I
telnet to their domain, the domain reply was cannot
resolve us (203.1.1.2 for example),I had a look on the
question. we have a antivirus SMTP gateway(smtp.test.com).
all incoming e-mail get scan before it will pass to our
exchange 2000 server to process. All outbound e-mail are
sent out directly to the destination Server. the IP
address will get translate from internal private IP eg
192.1.1.2 to public IP 203.1.1.2

We have 2 external DNS
Can we set the DNS 203.1.1.2 (mail translate IP) is
(smtp.test.com) or do we have to do this on the Firewall ?
DNSStuff.com. and discovered there was a reserve lookup
issue.


Thanks

 

[Kevin D. Goodknecht [MVP]]

In

Hi everyone.

We been having e-mail problem send to priticular domain, I
telnet to their domain, the domain reply was cannot
resolve us (203.1.1.2 for example),I had a look on the
question. we have a antivirus SMTP gateway(smtp.test.com).
all incoming e-mail get scan before it will pass to our
exchange 2000 server to process. All outbound e-mail are
sent out directly to the destination Server. the IP
address will get translate from internal private IP eg
192.1.1.2 to public IP 203.1.1.2

We have 2 external DNS
Can we set the DNS 203.1.1.2 (mail translate IP) is
(smtp.test.com) or do we have to do this on the Firewall ?
DNSStuff.com. and discovered there was a reserve lookup
issue.


Thanks

Generally, unless you have explicitly asked your ISP to do so, you do not
have your reverse lookup delegated to your DNS server.
You will either need your ISP to create the reverse lookups on their DNS
because they own the reverse lookup authority on your IP or have them
delegate the reverse lookup to you. If you own a block of IPs they will
usually have no problem with this. All you need to do is create a reverse
lookup zone using your NetBlock ID, then create the PTR records in that
zone.

 

[Michael Johnston [MSFT]]

You will need to have your ISP create a PTR record for your public IP address.

Thank you,
Mike Johnston
Microsoft Network Support
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