I am very new to Linux and am having trouble setting up my 4 port modem/router.

I have knoppix loaded on a Dell Laptop and I want to connect to my modem/router by the USB port. If I look in USB VIEW it tells me that it can see a USB NET CARD but I am unable to get the connection to work. Every time I try and configure the network card it tells me that I do not have a netwrok card installed and do I want to run modconf. I have run this and have tried every USB netwrok device in the list but with no joy.
The modem/router is an ASR Origo, is this just not compatiable with Linux?