Hi,
I configed the dsl connection with the same progs I used in the cd booted system (exept there is normally no KNOPPIX menu entry).

Ran as root /usr/sbin/netcardconfig
Configured the nic to a static adress:
IP: 192.168.98.1
Netmask: 255.255.255.0
Broadcast: 192.168.98.255
Gateway: empty
DNS: empty

Afterwards I ran (as root again) /usr/sbin/pppoeconf
configed dsl provider &c.

Connects @ boottime.

I did this w/ about 25 installations - absolutely no probs.

tom