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NAT issue on site to site vpn's over cisco routers

Last Modified: 2012-05-12
Any connections from remote offices to main office where are servers are located, is blocked if it has a NAT rule setup for external to internal access.

Example:  Port 25 is PAT'd from outside interface to inside server address.  external access to 25 is fine.  Internal access from main network is fine.  Internal access through site to site vpn does not work.

Any help would be appreciated.  

Cisco routers with typical site to site vpn configuraiton.
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