Time Capsule & Port Forwarding

I have just set up my new Time Capsule. Everything works great other than being able to see my Defender security cameras through my locol network. Here is my set up. AT&T Westell 6100 DSL Modem set to bridge mode. My TC set up to connect PPoE. The TC has given the Defender DVR an IP addy. I have done the Port Mapping for the required ports to the Defender IP addy. When I type in the DVR IP in my browser I get the default "cant find page" or what ever. Any ideas. Thanks.