Moving to Linux - Hardware
Welcome to LQ
From the look of that thing, it just plugs into any Ethernet card. The modem/router should then be self-containing, or OS neutral (however the software used to configure the thing may not be). If the software is ran through a browser (as I've noticed MANY routers are) then you are good to go with any OS you choose.
So the trick will be getting your network card going. I don't know which module your card uses, but a quick google reveals:
So try this as root:
And see what comes up. That should be enough to get your started until some hardware nut comes along and feeds you the info to take you the rest of the way
If you need help, get stuck, or simply don't get any responses after a good 12-24 hours or so, feel free to respond back to see if anybody has more input.