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How to monitor and restrict Internet traffic to certain quota for certain computer on a peer to peer network? Is it possible to keep tabs on the Internet traffic going through the router without replacing it? Perhaps certain routers provide some similar function but I am not in the position to replace it as it is provided and designated by the ISP. I would like to get a warning when the pre-set quota for the specific computer is nearly up and if possible then stop the Internet connection to the computer.

I suppose I can have the computer set with a fixed IP address and somehow count the data going through the router from another computer which is not always turned on. Perhaps I need certain program installed on another computer connected to the router and retrieve the required data.