According to the manual for the gaming adaptor, it does have an IP address. (otherwise how do you set up all the wireless settings?) Check this link and see whether you have not missed something. It looks like your wireless link does not work, you say it has worked with a desktop PC, check that the settings have been saved. The part where you connect the XBOX should be replaced with the connection of your DVR.
http://belkin.httpsvc.vitalstreamcdn...20set%20up.pdf