Projects / Iperf


Iperf is a tool to measure IP bandwidth using UDP or TCP. It allows for tuning various parameters, and reports bandwidth, delay jitter, and packet loss. It supports IPv6 and multicast.

Operating Systems

Recent releases

  •  14 Nov 2008 16:24

    Release Notes: Version 2.0.4 allows the selection of the TCP congestion control algorithm under Linux, adds a manpage, and fixes some bugs.

    •  28 Jul 2003 21:23

      Release Notes: This release runs Iperf in bidirectional mode, removes the STDLIB requirement for Iperf, and adds client reporting of server-side statistics in UDP tests.

      •  24 Oct 2002 07:02

        Release Notes: This version includes better pthreads detection in the configure script, there is no need to explicity bind a IPv6 address on the server, and it binds to all IPv6 addresses when -V is used including IPv4 mapped addresses in some OSes. There is better support for printing IPv6 addresses, and support for setting the TOS field via IP_TOS and disabling the Nagle algorithm in supporting OSes. There was a clean up of stale or outdated files, debug messages for getaddrinfo were removed, and there is now better support for various std libraries.

        •  18 Jun 2002 23:08

          Release Notes: This release supports IPv6, using representative streams to measure bandwidth, and running as a Win32 service.


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