I have a Att USB connect Momentum 4G (313u) connected to Cradlepoint mbr95, my problem is: I connect my dvr that uses uPNP, I forward in the router the correct port, have upnp on, and there's no way to communicate from outside to the dvr.  I read in other forum there's a problem with the ATT momentum modem, that is behind a nat, and have a private IP, not a public IP in the ATT modem. I use the public IP to connect to my dvr, and nothing.

Suggestions ?

Thank you !