The gateway and DNS server parameters on your camera should be 192.168.1.254, the IP address of your RG. You could use it on your LAN with the gateway wrong, but not outside your RG. The DNS server would only matter if your camera attempts to connect to a server (e.g. a mail server) by name.
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I've got the same problem, as I'm tyring to configure my Q-See DVR but ports don't seem to get forwarded, even though the router configuration console claims they are opened and forwarded.
I really think AT&T is blocking these ports, as there seems to not be much other explanation.
I go to my internal address and see the DVR security cameras just fine, but the canyouseeme.org site can't detect any of the ports I've added, nor can I get to it on the external address, when connected outside of my router.
I'm open to suggestion for anyone who's done it successfully with a 2WIRE HVG3800 model router.
Guys I feel your frustration but I was able to get it working for me by going through the port forwarding normally and rebooting the system. It seem as though the Port Forwarding rules get saved but are not loaded. When the system reboots the rules that you setup get loaded. I hope this helps.