Again on ADSL and PPPoE

I have followed your advices and now I got adsl working... on the wrong computer! It works on the laptop, but it does not on the desktop, which should act like a masquerade router. The ethernet card works properly, I have tested it with my LAN. I really do not know what else I could do, and I am thinking about a fresh reinstall. I am using rp-pppoe in both computers, and the suse 2.2.16 kernel. Tazio