Found partly solution :

Removing and re-installing followed by pump -i eth0 solves the problem.

However, even after saving this new config to floppy, at next reboot the problem is back (even when rebooting with nodhcp)

When doing agin modconf, at re-install, it shows the values saved on the floppy.

Why doesn't Knoppix manage to get the eth0 started correctly ?

Thanks

SB