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Hi there and welcome
The ARRIS DOCSIS 3.0 Residential Gateway supports all this and is a very decent modem/router
Supports up to 2 lines and wireless N and can be purchased here
Click me to open
Will work on the comcast network
If you would like any additional information or assistance, please do not hesitate to let me know.
Else if you can take a second to rate my service by clicking one of the stars at the top of the screen then submit, that would be greatly appreciated.