Bandwidth hogs on my network

Can someone please point me to a program(virus, malware and adware free please) that will show how many megabytes up and down each computer on my network is using?
hrolsonsAsked:
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Matthew KellyConnect With a Mentor Commented:
Wireshark is the best program for monitoring network traffic: http://www.wireshark.org/
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Matthew KellyConnect With a Mentor Commented:
You can use Endpoint by IP to find computer usage: http://www.wireshark.org/docs/wsug_html_chunked/ChUseStatisticsMenuSection.html
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hrolsonsAuthor Commented:
So I grabbed 2 screenshots:

sshot1
sshot2
I don't really understand many of the top ones.  I did an ipconfig on all of our machines and the top one that I could identify came in 5th, and that was 10.1.10.10.

Can you shed some light?
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Matthew KellyCommented:
It is going to show to and from traffic seperately. For example the 208 addresses are google.  You can use nslookup to see the machine name of the 10.× ones (i am assuming that is you internal network ip space).
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Ken BooneNetwork ConsultantCommented:
So utilizing netflow is your friend here.  If you can use netflow, there is a free netflow collector from solar winds and there is a free trial usage of scrutinizer which I really like.    

If you don't have netflow capable equipment you can use an open source tool called ntop.  Ntop will give you the same type of information.
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hrolsonsAuthor Commented:
It doesn't look like either of those will work with Windows 7.
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Ken BooneNetwork ConsultantCommented:
Scrutinzer trial runs on windows 7

http://www.plixer.com/Scrutinizer-Netflow-Sflow/windows-version.html

In fact I just set up a trial for a customer on windows 7 2 weeks ago.

You need to make sure you core switch, internet router or firewall supports netflow though.
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