networking

Hi,

I recently had to deal with a bunch of Gaming Consoles (PS5 + Xbox) in a network. In the past I always go the UPnP route for them to get their "NAT Type 2" (open nat) achieved. Recently we had them sitting on to 1000 Series Cisco ASA with a standard NAT. No UPnP and I was a bit surprised why and how Cisco manage that all the consoles can achieve NAT Type 2 without upnp.

Normally when the console request a fixed port to test the nat capability and is not flexible with that. So external port rewriting not working. This is where UPnP steps in and rewrite. But on the ASA Configuration was nothing else then the default cisco NAT involved and it was flawless.

Anybody with more Cisco experience than I can shine some light on that for me?

thanks