Need software to monitor bandwidth usage. What software is available

I'm looking to monitor what the users are downloading.  I'd like to be able to see what computer is downloading what file.  We are non-profit (Society for the Prevention of Cruelty to Animals) so I don't have thousands of dollars to spend.

Is there anything affordable and easy to use?  Especially "easy' to use?
J.R. SitmanIT DirectorAsked:
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Will SzymkowskiConnect With a Mentor Senior Solution ArchitectCommented:
I think a better statement would be what type of firewall should i get. You can then monitor everything that leave's or enters your network. I would recommend getting an appliance from PaloAlto Networks. They can be a little expensive but they have different levels small business, medium, enterprise. Another good appliance you could possible leverage is a FortiGate Firewall. This is a little cheaper than PaloAlto and has a lot of good tracking features.

Having a piece of software will probably not cut it for what you are looking to do. Installing some software on your machine or even monitoring a port on a switch will not give you all of the information you are looking for as there are many paths data go through. At the firewall level all traffic goes through there.


Will.
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J.R. SitmanIT DirectorAuthor Commented:
We recently installed a Cisco TZ215.  What do you know about that model?
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1mdConnect With a Mentor Commented:
This software is very good and can be used free of charge

http://www.paessler.com/bandwidth_monitor
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MintarConnect With a Mentor Commented:
You need to setup a mirroring port in your cisco switch, then deploy a passive monitoring program to monitor internet downloads.

Programs you can try:

1. WFilter(free version available) - http://www.imfirewall.us

2. Gfi webmonitor

3. Websense
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J.R. SitmanIT DirectorAuthor Commented:
All your help is appreciated.  If I knew how to program the firewall that would probably be the best solution.

I'm testing the software recommendations and like Paessler.

Thanks
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