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I need to monitor users on my network. I currently use a captive portal router that gives users access and assigns them dynamic IP addresses. How can I monitor which sites my users are browsing and the amount of bandwidth they are consuming?

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That all depends on what facilities your router has. Please post make and model number. – Matt Jenkins Mar 11 '11 at 17:29
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I can understand the need for bandwidth monitoring, but actually monitoring which specific sites they are browsing is a serious invasion of privacy in my opinion. Consider using filtering instead of monitoring, in conjunction with only bandwidth monitoring, if you suspect users of browsing inappropriate websites. – Breakthrough Mar 11 '11 at 18:31
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migrated from superuser.com Mar 12 '11 at 13:40

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2 Answers

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Try ntop. From the description:

ntop is a network traffic probe that shows the network usage, similar to what the popular top Unix command does. ntop is based on libpcap and it has been written in a portable way in order to virtually run on every Unix platform and on Win32 as well.

Here's a screenshot showing some of the automatic graphs that it produces:

ntop search

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Setup a proxy server like Squid and route all internet traffic through it...

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