My apologies as I had a very busy weekend & had I caught this on Saturday evening, then you would have had your answer immediatly.

In your case, you have run into a known issue with Knoppix 3.9 HD Installs in that it breaks networking. The bug is documented as #15 http://www.knoppix.net/wiki/Bugs/3.9-2005-05-27 and can be resolved by entering the command as root user:
Code:
ln -s /etc/init.d/ifupdown-clean /etc/rcS.d/S18ifupdown-clean
BTW, what's all this whoopla on the forum lately that KNOPPIX isn't intended for hdd install?
We have cautioned new users from installing Knoppix to the HD without first being aware that it might not work for them http://www.knoppix.net/wiki/Hd_Install_HowTo.
Past discussion on this topic started at "ManPages in Knoppix 4.0" and continued at "Why not Knoppix on the HD?".