get a letter from Comcast say I need a new docsis3 .0 modem , so I look up what be a good one and this one come up ! very easy to setup , just call COMCAST FIRST ! I try a few time to do the automatic setup , but Comcast do not let you do it . it keep reset it every 3 minute or so , so it look like you can set it up and then it fail ... so just call Comcast -lrb- or you provider -rrb- and it work great ! use this with a Linksys ea3500 and it be a vast improvement over my old modem\/access point .