I buy this modem so that I could rid of the $ 7 monthly rent . it get provision fine but keep on get reset every now and then . in two day time it have be reset on its own like 5-6 time . I buy this modem instead of Motorola surfboard as I already have a Linksys wrt54g2 router but look like cisco modem be not even compatible with they own router . I have try so many time to hook up this modem with the router but no use . I want to save $ 7 rent but look like that cause I a whole lot of pain and if i continue to use this modem I might have to buy a compatible router worth around $ 60 - $ 70 . so look like to save $ 7 \/ month I be spend $ 170 - $ 180 upfront which do not sound good . I be gonna return this modem today . definitely will not recommend it to use with Comcast .