We finally got port forwarding set up here. We set the camera [Setup / Network Setup / Port Settings / HTTP Port ] to 8031 for the first camera and 8032 for the second. (31 & 32 are the final digits of their Static IP Address).
Our NetGear WNDR3700 router first needed to have its' [LAN Setup / Use Router as DHCP Server] range set to exclude the cameras' fixed IP addresses - an obscure clue found after web searching. Next we set [UPnP / Turn UPnP On] UNchecked; next, [Port Forwarding / Add Custom Service] where we set Cam1 for HTTP with 8031 in all boxes, and Cam2 HTTP with 8032 in all boxes, then Apply. Now, back to UPnP and turn it ON.
But some questions remain -
1. On the cameras [Setup / Network Setup / UPnP Settings / UPnP Port Forwarding], we've set one camera as Enable and the second on Disable. Looking at [Status / UPnP Port Forwarding], the first camera says "Port open success" while the second one says "Disable". However, both behave the same as far as I can tell. What is the proper setting (and why)? Oh - the 8032 pair does not show up in the router UPnP PortMap Table (3 entries for Cam1, 2 entries for Cam2).
2. On the iPad in Safari, going to WANip:8031/video.cgi or WANip:8031/mjpeg.cgi gives live video. The picture is live, but the blue loading indicator only 90% fills the address bar. Also image.cgi gives information about the video stream, and image.jpg gets a still image. This all when logging in as admin or with the cameras' Guest login.
3. Strangely, few other browsers I've tried on the iPad seems to work with the cameras' Guest login. Terra is one which works well. "Atomic Lite" also OK. In Chrome, WANip:8031/mjpeg.cgi gives a text page full of binary image data which locks up. "Browser" no go. "Opera Mini" only gets as far as authorization.