Iperf Speed Testing
Iperf is an industry standard tool for doing extensive speed testing. For all speed testing, ACD Network Operations and Customer Support use Iperf for all testing and debugging.
Information about Iperf is located here: http://en.wikipedia.org/wiki/Iperf
To download Iperf you can get it from IPerf from here: http://sourceforge.net/projects/iperf/