I am using Knoppix 4.0 with a Fiberline USB stick (driver: zd1211). The module loads perfectly, the WLAN access point can be reached (iwconfig shows the correct parameters), DHCP works - but then, no data can be transmitted.

ifconfig shows a suitable IP address (192.168.1.xx), /etc/resolv.conf contains the IP address of the gateway (192.168.1.1), and also if I set the route correctly (route add default gw 192.168.1.1) no IP traffic is possible. I can neither ping the access point (192.168.1.1) nor any other internal or external computer.

Does anyone have an idea what could be wrong? Btw, with Knoppix 3.8 it worked.
Thanks, Christoph