Issues

• SCTP interval reporting prints an uninitialized retransmit value

  esnet/iperf#2086 · Filter by author kulikjak opened on Oct 2, 2026

• CVE numbers mixed up

  esnet/iperf#2085 · Filter by author aschnell opened on Oct 2, 2026
  2

• Cannot use more than 128 parallel streams

  esnet/iperf#2079 · Filter by author sregister opened on Sep 24, 2026
  2

• iperf3.21 server end stuck in ESTABLISHED state when disconnected network

  esnet/iperf#2076 · Filter by author JesseXuan opened on Sep 11, 2026
  4

• get_results() passes 0 as max_size to JSON_read(), so a misread control-channel byte can trigger a multi-GB allocation instead of a clean error

  esnet/iperf#2072 · Filter by author pau-hedgehog opened on Aug 31, 2026

• dependency on cJSON?

  esnet/iperf#2064 · Filter by author thinrope opened on Aug 1, 2026
  2

• iperf_parse_arguments() spuriously fails on 2nd+ call in the same process: stale i_errno from previous run's normal completion misread as new parse failure

  esnet/iperf#2063 · Filter by author jerryabramson opened on Jul 28, 2026
  1

• Build failure on platforms without <stdatomic.h> due to use of non-standard u_int64_t

  esnet/iperf#2060 · Filter by author lgoettgens opened on Jul 13, 2026
  1

• iperf 3.21: UDP server with multiple IP aliases may send replies from unexpected addresses

  esnet/iperf#2059 · Filter by author garrymar opened on Jul 10, 2026
  1

• UDP loss figures incorrect and self-inconsistent against pre-3.13 peers (omitted_* substitution)

  esnet/iperf#2055 · Filter by author therealevanhenry opened on Jul 3, 2026
  1

• JSON output (-J) emits two top-level "error" keys on server-relayed errors

  esnet/iperf#2051 · Filter by author therealevanhenry opened on Jun 24, 2026
  1

• Separate UDP GSO and GRO controls for Linux (--gso and --gro options)

  esnet/iperf#2037 · Filter by author roaoliver opened on May 20, 2026
  1

• iperf3 server does not honour the bind command for sending data - sends from incorrect interface

  esnet/iperf#2036 · Filter by author peterm888 opened on May 20, 2026
  2

• Cannot utilize 100gbps on Mellanox ConnectX-5

  esnet/iperf#2031 · Filter by author antiuser opened on Apr 28, 2026
  3

• For udp traffic, if send is ubuntu and receive is windows, -P, --parallel will lead iperf error

  esnet/iperf#2026 · Filter by author llh8991 opened on Apr 15, 2026
  1

• Final interval report always delayed until result exchange

  esnet/iperf#2019 · Filter by author illarionov opened on Mar 28, 2026
  7

• some different between windows and linux

  esnet/iperf#1998 · Filter by author wangguowang opened on Jan 22, 2026
  4

• Handle interrupted tests (server)

  esnet/iperf#1997 · Filter by author terrancewong opened on Jan 20, 2026
  5

• The speed test failed because the address used in the ESt UDP connection was inconsistent.

  esnet/iperf#1996 · Filter by author Mozartor2 opened on Jan 13, 2026
  4

• UDP --bidir fails when Cygwin is server (works when Cygwin is client)

  esnet/iperf#1992 · Filter by author vikranthdatta opened on Dec 29, 2025
  1

• Server hangs endlessly (0.00 Mbits/sec) on sudden client disconnect – Works in 3.14, broken in 3.16+

  esnet/iperf#1986 · Filter by author Vili-B opened on Dec 17, 2025
  18

• iperf（v3.18）: error - select failed: Bad file descriptor （UAF in race condition?）

  esnet/iperf#1977 · Filter by author wangche1991 opened on Dec 1, 2025
  1

• high packet loss with UDP test 10G Domestic

  esnet/iperf#1963 · Filter by author vangvc opened on Nov 11, 2025
  4

• Queue tests on the server and have the client wait it's turn

  esnet/iperf#1959 · Filter by author Justinzobel opened on Oct 29, 2025

• Allow installing as a service on macOS via brew

  esnet/iperf#1958 · Filter by author marcleblanc2 opened on Oct 26, 2025
  1