I bought a ARRIS / Motorola SB6121 SURFboard DOCSIS 3.0 Cable Modem and Medialink Wireless-N Broadband Router with Internal Antennas (300 Mbps). I followed the instructions and not a single problem. When I checked my account with Comcast it showed my router in the list of my equipment. I did not call or anything. They obviously can see your equipment through the internet. If you want to use your own, I can vouch for these and they work great with Comcast service.
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