I be use this modem with with Comcast and a LinkSys ea4500 router and it constantly drop the internet connection . sometimes I have to unplug and plug back in the modem multiple time per hour . there be huge thread you can find online in which ton of people have describe they problem with this modem . I be extremely disappoint in Cisco and I warn people to stay away from this modem . the kind of problem this modem cause be really unacceptable and customer should not put up with be treat so badly , especially after they have pay a fairly high price for it .