Static public to private route not returning to source
First thing is my apology for making this so long but wanted to cover all the bases.
I currently use a Cisco 1800 router for VPN to my vendor. The vendor initiates the tunnel using interesting traffic with a specific port. This is where it gets confusing. They establish the tunnel from their peer IP to my outside FE0/1 interface by sending a packet to second public IP. I use static routing that maps the second public IP to the private IP of my host server (runs a communication application) through my FE0/0 interface.
When we test both phases of the tunnel come up and I see where the second public IP is translated. My application accepts the connection through the port. The issue is when my application tries to send the acknowledgement back it fails. Its as though the app doesn't know how to get the response back to the router and out the VPN tunnel. My vendor sees the application start then it immediately terminates. I'm not sure if the problem is with my router configuration or something on their end. The problem is not VPN related but something with routing
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