@bdwyer:
@MTHead:
So it sounds like what Cisco calls "PAT" is what I've always called "port forwarding" (and, in fact, in the pfSense GUI it's the "Port Forward" tab on the "NAT" page.)
No, that is static PAT. When he is talking about internet traffic and PAT, he is referring to dynamic PAT, where the translations are done automatically for your users so that the web host can communicate directly to the correct computer behind the source gateway. A static PAT mapping would be mapping a certain port to always go to a certain internal host, akin to what your talking about for port forwarding.
If you want to reference to pfSense, the closest thing to explain what dynamic PAT is would be the Firewall : NAT : Outbound page.
Thank you for that!