Proxies break lots of things.  Getting a handle on what's really  
sucking the bandwidth is important before throwing technical and  
political hurdles up to monitor/manage/mitigate it.  It could be  
torrents.  It could be just a couple of abusers.  It could be  
streaming vid.  It could be a growing number of virus-laden or zombie  
hosts spewing spam or other garbage.

A real cheap way to passively take a quick look is to put a 100M hub  
(not a switch) between the primary router and the first internal  
hop.  Into that hub, plug a laptop that has Wireshark installed.  A  
hub is $20-40 and Wireshark is free.  That will allow analysis of  
everything going in/out of the net.  That will provide information  
about what protocols and users are sucking the bandwidth.  It can  
also identify what the top web sites are.  Then if the situation  
warrants, a proxy might provide more detailed analysis and mitigation  
through policies.

The above quick look might help decide if you need to spend lots of  
money for a commercial monitoring/management solution.

...Barb
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