Cisco ASA NAT Port Forwarding

Hello Bruce

Although it is true that the vast majority of NAT configurations are indeed nat (inside,outside), there are situations where the nat(outside,inside) scenario is useful. One such example is if you have a web server that is on the Internet that you want users on the inside of a network to access using an internal private address.

This example can be seen in the following Cisco documentation on pages 2 to 4 in a section titled “NAT for Inside Hosts (Dynamic NAT) and NAT for an Outside Web Server (Static NAT)

I hope this has been helpful!

Laz