Wrong IP in message headers causing NDR's

Posted on 2008-11-12
Last Modified: 2012-05-05
We have an Exchange Server that is reporting its IP address as that of the router as opposed to the correct outside IP address.  Let's say its internal address is, and it's outside IP address is NAT is being performed by a Cisco ASA, the ASA is connected to a Cisco 2800 series router who's IP address is, let's say  If I telnet somewhere from the Exchange Server's console, I'm being seen as coming from the routers IP address as opposed to the outside IP of the Exchange Server; this is causing some email to fail.  

How can I make the Exchange Server be seen as though it is coming from the correct IP address?  Not sure if this is a Cisco or Microsoft question but if I had to guess it is squarely in the hands of the ASA.
Question by:celeste222
    LVL 7

    Accepted Solution

    sounds like your route is falling into the NAT translation pool.
    Try building the route without defining the port.


    Author Comment

    Thanks for your reply.  I've removed the static (inside,outside) entries with port definitions from the ASA per your recommendation and this appears to have fixed the problem.  I'm going to keep testing and make sure then accept this as solution.  Thanks.
    LVL 7

    Expert Comment

    There is a post on here somewhere from me asking the same question like 4 years ago hehe ;)

    Author Closing Comment

    Thanks for your fast and accurate response.

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