to all you naysayer , let start here : this be purchase for use on Comcast . yes , Comcast currently have this very modem on they `` approve '' list ; yes , I do my homework ; yes , I be smarter than a rock ; and yes , Motorola should have do more to insure they product work reliably on such a major provider system . this modem refuse to provision on the network , simple as that . Comcast could see the modem , ping it and send the provision information ... the MODEM refuse it . so do the second modem . I be a big fan of Motorola product but this be disappointing . also , the HFC MAC seem to be all wrong . most mac start 00 and these be start with 74 . I do not know if that contribute to the problem or not though .