telindus nd220 on mandriva 2006: link led

I've just installed the lasts eagle's drivers (eagle-usb-2.3.2.tar.bz2),
the terminal says that is ok, all working... But the "link" led of the
modem ADSL turns on for a little time, then it turns off, then on, etc.
So, neither linux thinks that there is an active connection, the
connection is not active. Or maybe only for few seconds: when the led is
on. In fact, I tried to go to google and firefox could download a little
part of the page and then it stopped...
What shall I do?
Thank you