How Do You Set Up a Router to Work with the Xbox?

I bought one of those routers that supposedly if you connect to the back of the xbox via ethernet cable then you should be able to communicate to your network and connect to xbox live. If you want to know the router since it doesnt have a specific name, just go on ebay and search "Wireless N Network Router Adapter for Xbox 360 PS3 Wii" I looked online and I tried to set up the router to act as a client. When I plug it in to the xbox I get the "DNS cannot be resolved" issue. I have the xbox set up to automatic and it is getting the info from the router. I am wondering does anyone have one of these routers and if so how did you set it up to connect to xbox live.

Suggestion:

Hi,

Try this:- http://www.unofficialguidetolive.co.uk/faqs/article/81-dns-internet-failed-xbox-360-live-test

If you are still stuck post on their forums and they will help