回复：yes, I tried this way:

typed into my username and password, and choose PPPoe, but still cant get connected to the PPPoe server.

I can get online connecting the modem directly to the computer without any problem, once I add the router in, then it does not work for both of computers.

The ISP is AT&T, and the router brand is Linksys.Is there any possibility that this kind of router is not suitable for the AT&T DSL service?

Thanks again!