Direct tv media sharing with an imac computer

I have two HD-DVR's, with the whole-home network, both receivers have the decca hook up.  In the den, I am using a Qwest wireless router/modem.  I just bought a Panasonic TV with DLNA for internet apps, along with a Panasonic Blu-ray player and an Onkyo AV receiver with 3D pass through and 1.4 HDMI.

All of these are DLNA and because I did not want to use the wireless LAN adapters because of lower signal problems so I hard wire these to a Belkin 4 port cable/dsl gateway router.

I took an ethernet cable from the empty port behind the HD receiver in the living room and hooked it to the WAN port of the Belkin, then I took an ethernet cable on port 1 of the router to my TV, and I got the internet access to my TV with Panasonic's apps.  I took another ethernet cable to port 2 to the Onkyo, and another one to my Blu-ray.  I have internet access via the Belkin router, but I can't get the media sharing applications to work.

I called DTV today, and he said that I should not hook up anything to the back of the HD receivers ethernet port; it has to be blank and that is why I am having the problems.

Is he right?  How can I hook up my Belkin router to hard wire my equipment, or should I use the wireless LAN adapters that I bought for the TV, Onkyo receiver, and Blu-Ray player, then maybe the media sharing on my mac will work?  My Belkin router's lights are on when the equipment is on so that shows I have internet access.

I have posted my question to the Apple forum and most have good success, but I don't know if they are using Direct TV and the whole home network.

Thanks,

Daisymay