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3800HGV-B - AppleTV - Aiport Extreme & Firewall

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I am trying to figure out how to best run the following setup: AT&T's (dated) 2Wire 3800HGV-B modem/router as the main modem-router-hub - then I'd like to hardwire my Apple Airport Extreme base station to it, set it into bridge mode and use it as the faster wireless IEEE 802.11n hub. My main concern is internet streaming (Netflix, iTunes Store content) through my 3rd gen AppleTV that's connecting wirelessly to my network. I have no TV box on the U-verse service - just their fastest internet package. Right now I am using the 3800HGV-B's slower 802.11g wireless network and my AppleTV. The Airport base station is not hooked up yet. When I used AT&T's default setup, the AppleTV's streaming speed would not allow for 1080p or even 720p streaming without constant rebuffering. So I enabled DMZplus mode for the AppleTV and that solved that problem. I can now stream 1080p. But what happens when I add the wireless router? It's another device. Many people seem to suggest that DMZplus should be enabled for the wireless 3rd party router (Apple Airport Extreme in my case). If I do that, I can't do it for the AppleTV any more and that may slow down my streaming again. Is there a way to poke holes into the firewall of AT&T's RG for more than one device? Whenever I have tried that so far, the router seems to assign the very same IP address to all the devices that I did modifications on in the firewall settings. Doesn't that create conflicts? Thank you so much in advance for helping me out on this confusing issue.

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