There is no reason why it shouldn't work. I have used both Mandrake and Gentoo on SBC Yahoo DSL. They just say they don't support Linux because they are untrained in its use.
If you want to know for sure, boot up a Knoppix Live CD and try connecting to the net with the web browser. You may be able to configure some of the 2Wire routers settings from a browser by typing in
http://homeportal
It is possible you may have to setup the modem from within windows, but once it's setup, it will work in Linux.