I purchased a TPlink M7350 3/4g radio broadband wifi modem in my quest to get a Bendigo Telco (Optus) mobile broadband to work. The sim supplied worked OK in this and connected to the internet OK. There are a number of reports on the net of this modem working OK with Linux. All reports were with Ubuntu and stated it worked out of the box, ie connecting the unit up via its usb cable resulted a connection to the internet. I run Debian with FVWM as window manager none of debians Network managment tools are installed as far as I know. There are two ways of working with the device one is via radio, I assume wifi, the second is via its usb port. For network communication via the usb cable the kernels rndis_host module is used. With it installed pluging the TPlinks in produces the kernel network interface usb0. What config is required for this, I added a usb0 entry to the /etc/network/interface file but this did not work. the command "ifup usb0" produced the error............ root@wolfcor650d# ifup usb0 RTNETLINK answers: File exists Failed to bring up usb0. root@wolfcor650d# ifdown usb0 ifdown: interface usb0 not configured Unfortunately I know little about network configuration under Linux can any one help here. Lindsay