Hello. I just replaced my Comcast rental modem with a Motorola SB6141. I called Comcast to have them add it to my services. This worked fine, and I am able to connect a computer via ethernet to my new modem with no problem. However, when I go to connect a router to it I get no internet signal. Are there any addition step(s) that I need to take to get my router to work? Any help is greatly appreciated. Thanks.