This modem was purchased through Amazon and fulfilled by SSDEALS. The intent was to replace a rented modem from Comcast.Installation was a breeze and I was up and running in no time. The problem was that this was a used modem and Comcast claims they have the MAC address registered and claim it is their modem and refused to remove the monthly rental fee. After many calls to Comcast I still have not been able to resolve the issue. I may have to return this or eat the cost and buy a more costly modem at a retail outlet to solve my original issue.