Hello, I have an ASA5510 (8.04). I have configured it so my primary T1 and my backup DSL run into the device. The ASA monitors a router in my primary ISPs network and fails over to the backup DSL when the primary monitored host is not reachable. That part works great. When it fails over, I can continue surfing the internet via the backup DSL, etc. My static NATs are bypassed and all devices (even those with the defined statics) go out the backup ISP via PAT on the backup interface.
My question is this. I have an exchange server behind the firewall. Is there a way that I can open port 25 from the outside and forward that to my internal exchange server when the firewall has switched over to the backup ISP?