How to test bandwidth on LAN segments

I've noticed that my throughput when downloading files from the internet, much lower than others on different disparate networks.

This made me start thinking about how I can "easily" test segments of my network for throughput (e.g. from device to switch (I use an Extreme Networking switch infrastructure and Cisco firewall/router) or device to device through a switch, etc.)

Aside from the obvious of transferring a file of know size, timing it and doing the math, are there any tools (free or otherwise) that can make the job easier?

Many Thanks,

John  88{Q
tcengineerAsked:
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Khandakar Ashfaqur RahmanExpert/ConsultantCommented:
Use the following tool:
http://xjperf.googlecode.com/files/jperf-2.0.2.zip

You need to run xjperf into both end.One end should run as server and another should run as .

If you want CLI based program:
http://omasse.blogspot.com/2010/12/iperf-205-for-windows.html
http://openmaniak.com/iperf.php
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tcengineerAuthor Commented:
Sorry for the delay; I've been out of town.

So I understand, if I wanted to test throughput of every switch, I'd need clients/servers on every switch to communicate between?
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Khandakar Ashfaqur RahmanExpert/ConsultantCommented:
If you want to test throughput of switch simply connect 2 computers into that switch and start test between 2 computers.traffic will pass through the switch and you can determine the maimum throughput of the switch.
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tcengineerAuthor Commented:
Sorry for the delay. I tried Ixia QCheck and it appears to work. I'll need to do more testing and installations at various locations on my network but this well for an "on-demand" check.

Thanks for your suggestions!

John  88{Q
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