People are often concerned about measuring the maximum data throughput rate of a communications link or network access. A typical method of performing a measurement is to transfer a 'large' file and measure the time taken to do so. The throughput is then calculated by dividing the file size by the time to get the throughput in megabits, kilobits, or bits per second.
Max. Throughput = TCP Window Size / Round-trip time.
Bandwidth Test Website:
http://www.speedtest.net
http://www.2wire.com
Related stuff:
Iperf was developed by NLANR/DAST as a modern alternative for measuring maximum TCP and UDP bandwidth performance. Iperf allows the tuning of various parameters and UDP characteristics. Iperf reports bandwidth, delay jitter, datagram loss. Download iPerf
ttcp - test TCP and UDP performance. go to Ttcp website
Wiki [http://en.wikipedia.org/wiki/Measuring_network_throughput]
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