What is a good way to analyze network bandwidth utilization?

Need a way to monitor and analyze how network bandwidth is used on small AD network behind PIX and perimeter router.  Small budget, however solution would ideally disclose how much bandwidth is being consumed, which subnets the traffic is originating from (or destined to), and the applications (protocols) that are causing the traffic?
dealvisAsked:
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tkfastCommented:
You might want to look at

http://www.wallwatcher.com/ 

It's a great way to get logs in a nice graphical format and very easy to use.

Hope this help you out let me know if you need any other help
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dealvisAuthor Commented:
I will check it out and return with result.  Thanks for responding.
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dealvisAuthor Commented:
Thanks for the recommended solution.
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cyberaCommented:
I tried this software, but my trend micro labelled the lib as a virus...
will be testing out first.

otherwise, the software looks quite cool!
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Network Analysis

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