Monitor internet traffic

I have 30 users logging into a Wimdows 2012 r2 Remote Desktop Server. Every so often the internet traffic slows down drastically. I narrowed it down to this specific server. Is there any way that i can determine what user is monopolizing internet bandwidth?
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You will need to capture it before the router (if you have an IDS) or at the router.  If you have an advance router/firewall/UTM like Sonicwall you will have the flexibility to see this on the daily report which user and/or computer is using the most bandwidth.
IBSITAuthor Commented:
I have a Sonicwall but in the logs all it states is the ip address of the server and the amount of data usage but this server is being accessed by many users.
Providing you have a compatible Sonicwall model, you also need the optional Sonicwall Analyzer feature to be able to produce that report.  Then you will get the bandwidth breakdown per user.
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IBSITAuthor Commented:
Is there a free tool that can help, I am just trying to pinpoint what is causing the monopolization.
You will probably need to implement a box to sniff packets before the router.  You can use this trial version for your purpose.

"Usage monitoring is important to identify causes for bandwidth bottlenecks, that are not caused by faulty systems, but an excessive bandwidth usage by single servers or users."

madunix (Fadi SODAH)Chief Information Security Officer Commented:

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