Connect the modem to a wall outlet with a coax cable and plug the modem into an electrical outlet. Connect devices to the modem wirelessly, or with an ethernet cable to a LAN outlet on the modem. When ...
I have the same setup. I don't think there's an easy way to do it without swapping network cables around. If there was an easy way to do it I think NAT would be a useless security feature. I maybe ...