esnet/iperf 3.20

iperf-3.20

on GitHub

iperf-3.20 2025-11-14

NOTE: iperf-3.20 incorporates all of the changes in prior iperf3
releases, including iperf-3.19.1.

• Notable user-visible changes

  • Millisecond-resolution representations have been added to JSON
    timestamps. (PR #1846)

  • The reorder_seen metric, where available, is now available in
    the JSON output. (PR #1278)

  • A division by zero error has been fixed. (PR #1906)

  • Some command-line options were not properly restricted to the
    client or server; this problem has been fixed. (#1892 / PR #1894)

  • The combination of --udp and --file is now explicitly
    disallowed. (PR #1909)

  • It is now possible to get both the full JSON result object as
    well as streaming intermediate JSON result objects. This
    functionality is enabled by using the new --json-stream-full
    command-line flag, in addition to the existing --json-stream
    flag (PR #1903)

  • Sends with --zerocopy are now properly seeded with data
    instead of being all-zeroes. (PR #1909)

  • The --time flag is now allowed on the iperf3 server to impose
    a maximum duration on timed tests. (PR #1684, PR #1931)

  • The --rcv-timeout flag is now ignored for --bidir
    tests. This change prevents premature termination of
    bidirectional tests. (#1766 / PR #1946)

  • Several errors in the authentication code were uncovered when
    building with OpenSSL 3.5.3 and later versions. These were
    fixed. (#1951 / PR #1956)

  • Various issues in the iperf3 manual page were fixed up. (PR
    #1887, PR #1927, PR #1936, PR #1941, #1891 / PR #1952)

• Notable developer-visible changes

  • A build failure with uClibc has been fixed. (#1888 / PR #1890)

  • It is now possible to use the API to load RSA keys from a file.
    (PR #1889)

  • Some calls to sprintf() were replaced with calls to
    snprintf(). There were no hazards in the code as written, but
    this change might help silence some compiler warnings and
    potentially prevent future vulnerabilities. (PR #1929)

  • Proper error handling has been added to the unit_atoX()
    functions. (PR #1394)

  • Some memory handling errors in t_auth were fixed. (PR #1953)

  • Minor enhancements and fixes to GitHub Actions workflows (PR
    #1919, PR #1928, PR #1942).