Download of jperf-2.0.0.zip (jperf-2.0.0.zip ( external link: SF.net): 2,830,574 bytes) will begin shortly. If not so, click link on the left.
This is the old, Iperf 2 code base. The primary development has moved to Iperf 3 which is hosted on Google Code. You can find it here: http://code.google.com/p/iperf/.
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.