I have exactly the same issue. I also use the broadcom iLine card to connect through my phone lines to go through the router and my cable modem. (I use a generic 3Com card on a third computer to do the same thing).

If a solution is found, I certainly would appreciate any help that is available about how to implement it. (I, also, am new to Linux--but I am certainly impressed by what I have seen so far.)

Thanks in advance.