Write the settings down on a piece of paper and fill them in netcardconfig. Not sure about 'ipconig' but it's worth a try!

'netcardconfig' is the command that you type at the prompt in a console (same sort of thing as the 'DOS prompt' that you mentioned, but for Linux), or you can find it in the KDE menu under 'KNOPPIX' and then 'network/internet' then 'network card configuration'

Good Luck!