I am using cisco ASR1002 as core router for natting all my traffic. I have few servers which has static nated to public IP and few dynamic nat for other traffic. From few days we have problem with our Exchange 2010 servers going to mail.messaging.microsoft.com on port 25 using dynamic nat even though static defined. we have cleared the nat translation for this IP, but no use. we have asked exchange team to stop the connection for some time to get the nat clear. even this didn’t help. The same problem is there for 3 other messaging servers. But when it use back up router its work fine. config is same on both routers.
As a work around, If static NATing is deffined for few servers you then you can remove those fron dynamic nating by using ACL for dynamic NATpool
For clear picture please share the nat translation
Nat Translation will show taking dynamic address only....nothing spl.
i know i can apply access-list only, but i dont want to try that in DC setup.
Please suggest some thing.
Possible to share the nat configuration along with your exchange server IP's which are having problems? This will help to diagnose further.