By “break,” I mean something more like “mortally confuse.”
I was setting up new Xfinity equipment. Formerly, there was a cable modem which provided one outgoing internet connection, and then a router to send the net wirelessly to several other devices, along with one desktop PC that had a wired connection to the router.
I did not realize at first that the gateway device IS a router and, yup, I plugged the router into the gateway device first. Once I realized my mistake, I tried unplugging the router from the gateway, and just plugging the one PC into the device directly, but no internet connection results, and the light next to the ethernet receptacle on the gateway device stays orange (no go). I tried all six of the ethernet cable sockets. The internet connection now only works going from the gateway through the router.
Now, I’m the first to admit that my IT skills are rusty, but I suspect that what I have done is trained the gateway device to the old router’s MAC, and now I am screwed. (Please tell me if I am wrong.) Then again, the thing is MADE to have several simultaneous wired and wireless connections. I really don’t know what the problem is.
BTW, I tried a hard reset with everything unplugged and then starting the installation over, but that changed nothing.