I'm running a toshiba cable modem (roadrunner) and have a netgear RT314 router. There are 2 computers hooked up. When neither computer is doing any internet activity (the act lights for those two ports show NO activity) the cable modem port and the modem itself show constant activity. Any idea what this might be? Is it normal? I don't remember seeing it before. Am I getting hit by hackers or something? How would I check this?