Already a good tip. Tnx for sharing the info.
But seems to me this is only for harddisk installed knoppix ?

Code:
Next, create/modify files /etc/ppp/peers/adsl /etc/ppp/chap-secrets /etc/ppp/options
no, it is really for live cd.
I have tested and these files are writable in the live cd, and are even saved in your persistent home.