The ultimate speed test software for TCP, UDP and SCTP

Iperf
Download Iperf

Mark Gates  -  Freeware
iPerf is a tool for active measurements of the maximum achievable bandwidth on IP networks. It supports tuning of various parameters related to timing, buffers, and protocols (TCP, UDP, SCTP with IPv4 and IPv6). For each test, it reports the bandwidth, loss, and other parameters. This is a new implementation that shares no code with the original iPerf and also is not backward compatible.


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