I never got any of my wireless cards to be detected by any Knoppix up to 3.7. Knoppix 3.8 did detect my Belkin 802.11b card and I could use it just fine, although it would still not detect my Dlink 802.11b cards.

This is not a Knoppix or Linux problem, as such. It's an issue of the card and chip makers not releasing specs for the hardware so that Linux programmers can write drivers for them, There are some cards out there that have good Linux support (although they never seem to be sold at my local store and they never seem to be inexpensive when I find them mail order). And their is another approach that some people have gotten to work - a hack that runs the card with the Windows drivers for it under Linux with software called NdisWrapper.

Also, expect better results if you are trying to get a simple 802.11b PCI or PCMCIA card working than if you are trying to get an 802.11g or one of the newer faster cards that are targeted at standards that don't even exist yet, or if you are using a USB wireless device. Sorry, but adding the USB interface just adds an extra level of complexity to the problem.

You might want to post exactly what hardware you are using so that if anyone else has it working they can tell you.