ASA 5520 Reverse DNS lookup Issue

Unanswered Question

We are having Reverse DNS issues. = Exchange Server

Windows 2003 = DNS server internal.

Setup: 1 to 1 NAT smtp --> smtp

Int gi0/2 =

Incoming Access Rule:

any --> smtp permit

When we do a WhatismyIp on exchange server it says the IP is

It should be

This is causing our email to be rejected from external sites due to reverse dns not returning 218. External people say are email is coming from 217. Comcast says the reverse pointer is setup correctly.

What are we doing wrong?

Thanks for any help you can offer.

I have this problem too.
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rahmant Tue, 04/01/2008 - 16:45

Can you show the specific "static" entry in your config for the NAT you're attempting?

mahirvrazalic Tue, 09/27/2011 - 09:10

did you ever figure out this thing with the reverse DNS showing PAT ip and not that of external MX record? What was the solution? Having same issue.


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