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I have a small local network that share an internet connection through a simple wireless router.

I would like to measure how every computer is using the local and external bandwidth and how much data each computer downloaded from the external network.

Is there an application that I could install on my computer to measure this?

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I see you used the network-monitoring tag. Have you tried looking at any of those questions and seeing if any of the tools work for you? – Zoredache Nov 10 '10 at 22:19

Use Ntop.. It perfectly suffices for this type of thing.. :D

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MRTG is also made for the task, but is a little more involved to setup:

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PRTG is a Windows port of the venerable MRTG and extends the functionality to other types of monitoring. It is free unless you want to monitor more than 20 devices.

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