What version of Knoppix are you using? Check out what was added in the last line of the changelog in the 07-25 version.

* V3.2-2003-07-25
- workaround atempt for erraneouos DNS update script of pppconfig 2.2.0
- dma bootoption now also enables DMA for CD-Roms
- enable Promise controller softwareraid on boot (Kernel 2.4.21)
- added atmel drivers for wireless cards

I'd be interested to hear how things work with post 07-25 versions.