I get the same problems with Knoppix (version 3.6). As I try to set up my internet connection I don't get further than the 2nd step in the wizard. At the first step it detects my ethernet divice (eth0) properly, but in the 2nd one I get the following error massage: "Sorry, I scanned 1 interface(s), but the Access Concentrator of your provider did not respond. Please check your network and modem cables. Another reason for the scan failure may also be another running pppoe process which controls the modem."
But the network cables are fine, and there is no pppoe process running that I'd know.

Could U help me with this problem, pls?!

jns