It's that fucking CD they pass out. ATT gave me one years ago, I was one of the first adopters of DSL in my area. If I had just set my router, which I eventually figured out, I would have been fine. But customer support at ATT kept insisting that they didn't support Linux. I actually had to go to the library to figure out how to get it working. I was new to Linux, and the distros back then (7-8 yrs ago) were much less polished. Even though I consider myself pretty smart, it took quite a while and a lot of work to get online.