Network Bandwidth Problem

Hello everyone,
I am having bandwidth issues in my network. The current internet line from the ISP is 50Mbps, but we are not getting the complete bandwidth (almost 20Mbps is lost). I have been analyzing the network past few days using PRTG and learnt that a major portion of the bandwidth is being utilized by an unkown Source IP going towards unkown destination IP using an unknown port number(none of the IP's and Port are being shown in their respective tables, just the utilized bandwidth shown but rest of Source IPs, Destination IPs & Port being used are shown), So I came to a conclusion that some one in my network might be using a proxy such as hotspot shield which is taking major portion of the bandwidth and where i assume the bandwidth is being leaked. Is there any means of blocking the use of hotspot shield?. I am not sure whether this is the actual problem, Or are there any other possible problems such as a bad network layout. help needed badly
Thanks in advance

You haven't provided enough information to make an informed recommendation.
A high level description of your network connectivity and information about what instrumentation your used to draw the conclusions you have from PRTG would be a good start.
You need to ensure that your are capturing information from the right point (or points) to account for all the the load presented to your provider.Typically this would be a Netflow export and/or SNMP query taken from an egress interface at or near your provider handoff.

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I believe I have found the cause of the Network Extender problems surfacing in July, 2011. I am a customer who has been out of Network Extender usage for two weeks now. Read on....
"Unbelievably, almost no one at Qwest, Verizonwireless, or Samsung (NE's manufacturer) has any idea what the cause is and neither Qwest nor Samsung knows that a problem exists at all.
After many hours on the phone to all three companies I finally believe I know the cause of the problem. The cause is an updated firmware revision that was pushed to all Qwest customers who use the Actiontec PK5000 modem/router. They have been pushing it out over the last few weeks, so the symptoms have been rolling rather than happening all at one time.
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IdeaPad: U350
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