Hello, I have a macbook pro and a comcast cable internet connection running through a D-Link DI-624M wireless router. I live with a few roommates, and every time one of them turns on his computer our connection slows to a snail's pace. He's kind of the black sheep of the house, so my question is: Is there any software that I can run from my computer to check how much bandwidth is being used by each computer on my network, to find out if the lag is caused by him? Also, is there any way to limit the bandwidth that each computer can use and give priority to specific IPs? Thanks in advance for any responses.