help with modem and routers i am now living on my own and i need some help setting up my internet, tomorrow i have someone coming over for comcast installation and i told them i would have my own modem. I bought a modem Motorola SB6141 since it was on the page of comcast supported modems. On the back of the modem it says wifi is not supported and I need wifi since I have a roommate and be both use laptops. I looked online and it said I needed a router but all of the help threads online just confused me. so my question is do i need a router for my sb6141 modem and why? thanks