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unable to send internal email due to static nat

Discussion in 'Networking' started by joec22, Apr 10, 2010.

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  1. joec22

    joec22 Thread Starter

    Apr 10, 2010
    We have two exchange servers located in different cities connected by site-to-site vpn via cisco router and PIX. Once I added the static nat translation for the second email server, we lost ability to send from one direction. If I remove the static nat translation, it works.

    Here is the static nat and ACL:
    ip nat inside source route-map ISP interface Ethernet0 overload
    ip nat inside source static tcp 25 **.**.**.** 25 extendable
    ip access-list extended nonat
    deny   ip
    deny   ip
    deny   ip
    permit ip any
    permit ip any
    access-list 110 permit ip
    access-list 110 permit ip
    access-list 110 permit ip
    access-list 120 deny   ip
    access-list 120 permit udp host host
    access-list 120 permit ip any
    route-map ISP permit 10
     match ip address nonat
     match interface Ethernet0
    110 is applied to the crypto map, the crypto map is applied to outside interface eth0. The email server on the other side is Both servers can ping each other, but I'm thinking since the email goes through port 25, the 20.65 is not able to get a return from 30.70 because the router translates it to the public ip address which doesn't make it back through the vpn. However if I send from 30.70 to 20.65 it works fine. Does that make sense? Does anyone have any suggestions for what I'm doing wrong?

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