I'm trying to find some software etc to monitor how much data each IP address uses on my network at home.

The router is a Belkin F5D8631-4 N1 Wireless Modem Router.

All computers have a static IP.

I currently have wireless access to the router. That is, I connect to it wirelessly, while it is hardwired to another PC upstairs.

There have been a couple of arguments about who's been downloading/uploading the most and shaping our internet speed. I would like to find out definitively.

Any help would be appreciated.