Motorola Netopia 3347 - Can View Cameras Locally But Not Remotely

I need viewing a DVR camera system remotely through a Motorola Netopia 3347 router. I was able to view the system properly for a year with the old ATT modem and a separate router, but recently the modem crashed and ATT replaced it with this Netopia that I can't for the life of me, understand.I can view locally but not remotely from the internet. I need establishing the Pinholes properly. I'm trying to get it working for port 85 for the DVR system. But I'm confused on the Internal vs. External port #'s it asks for in the Pinhole screen. No combination I enter seems to work. I even tried just using port 80 to get it working, but there was a conflict creating a pinhole for 80 since its already mapped to HTTP.