when COMCAST decide to increase they cable modem rental fee 66 % in November , to $ 5\/month , I decide to do something about it . this $ 68 Linksys Cable Modem , Model CM100 , be exactly what you need . you can check on the COMCAST website for a whole list of compatible modem . I decide on this one since I have a Linksys router -lrb- wrt54g -rrb- . this installation be very simple . remove the COMCAST modem . someone in another review say you need to remove you router temporarily for this installation , so I do that and connect the cm100 directly to the ethernet connector on the computer . once you do that , you need to call COMCAST and give they the s\/n and the MAC Address , both of which be print on the bottom of the Linksys cm100 unit . they enter you new info in they system and you be up and run . it really be as simple as that . you can then go ahead and reconnect you router . I find I have to power off\/on the cm100 , router , and computer and I no longer have to pay COMCAST monthly .