im using a Sierra Aircard 760s on the Telstra Bigpond network (Australian ISP) and i have a strict NAT.
i have tried UPnP, DMZ, and Port Forwarding, but none of it seems to work.
it is indeed mobile broadband, and DOES have a real world WAN IP, however it is not static (it changes every time i reboot router)
i need this issue fixed, as gaming with a strict nat is horrible!
extra information: I've contacted Sierra, and they didnt do anything. telstra tried, but all they did was direct me to their $90 support service.