Freedom251 › Network Diagnostic Software
iperf2
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Professional edition | permit-key access gating · server-side latency histograms · UDP L4S · source and build available at no cost | Free |
As sourceforge.net lists them, read 15 Oct 2026. The maker's own page has the final word.
Facts from iperf2's own pages
- API and SDKs
- The published developer interface is the command-line program and its documented options; no separate REST API or SDK is described on the project pages. · iperf2.sourceforge.io, 15 Oct 2026
- Company and maintainer
- Robert (Bob) McMahon is identified as the creator and maintainer of iperf2 and as founder and CTO of Umber Networks. · linkedin.com, 15 Oct 2026
- Development history
- The iperf3 FAQ states that McMahon restarted iperf2 development in 2014 after the original project had been orphaned, adding fixes and features while retaining broad platform support. · github.com, 15 Oct 2026
- Documentation depth
- The project publishes a user manual, a man page, installation instructions, option reference, examples, diagnostics and bug-reporting guidance. · iperf2.sourceforge.io, 15 Oct 2026
- Enhanced metrics
- Enhanced reporting can expose RTT, congestion window, retries, packets per second and latency-related values. · sourceforge.net, 15 Oct 2026
- Extensibility
- The source includes a Python asyncio flows framework and compile-time configure flags for professional features, fast sampling and diagnostics. · iperf2.sourceforge.io, 15 Oct 2026
- Independent packaging
- Homebrew provides a brew install iperf formula, identifies the software as a TCP/UDP bandwidth tool and lists BSD-3-Clause licensing with macOS and Linux bottles. · formulae.brew.sh, 15 Oct 2026
- Installation
- Source builds use GNU Autotools with ./configure, make and sudo make install; distributions commonly package it as iperf. · iperf2.sourceforge.io, 15 Oct 2026
- Interoperability limit
- iperf2 and iperf3 are independent implementations and do not interoperate at the protocol level. · iperf2.sourceforge.io, 15 Oct 2026
- Latency and jitter
- It measures latency, including one-way delay and round-trip time, together with UDP jitter. · iperf2.sourceforge.io, 15 Oct 2026
- License
- Debian's copyright record identifies the main iperf source and Broadcom-contributed files as BSD-3-clause licensed. · sources.debian.org, 15 Oct 2026
- Limit: Android availability
- AppBrain records the older Kaushik Battu Android app as unpublished from Google Play on February 6, 2025. · appbrain.com, 15 Oct 2026
- Limit: Android usability complaints
- AppBrain comments report missing one-click client/server setup, options requiring an app restart, IPv6 display and detection problems, and commands that did not work for some users. · appbrain.com, 15 Oct 2026
- Limit: long-run crash history
- A Debian bug report records iperf2 crashing during long tests on 40Gb/s NICs in version 2.0.10, with the issue fixed in 2.0.12. · bugs.debian.org, 15 Oct 2026
- Limit: UDP throughput variance
- A GitHub issue reports iperf2 UDP throughput around 557 Mbps where iperf3 reached roughly 900 Mbps in the same test setup. · github.com, 15 Oct 2026
- Limit: Windows UDP server bug
- An open SourceForge ticket reports that a persistent Windows UDP server can stop returning acknowledgements after the first client disconnects. · sourceforge.net, 15 Oct 2026
- Multicast and IP versions
- The implementation supports multicast including source-specific multicast, plus IPv4 and IPv6. · iperf2.sourceforge.io, 15 Oct 2026
- Output formats
- The command line can produce human-readable reports and CSV output; JSON output is not listed for iperf2. · iperf2.sourceforge.io, 15 Oct 2026
- Packet loss and ECN
- Packet-loss reporting and ECN measurements are included in the published feature set. · sourceforge.net, 15 Oct 2026
- Parallel and duplex modes
- Tests can use parallel streams, reverse traffic, bidirectional traffic and full-duplex operation. · iperf2.sourceforge.io, 15 Oct 2026
- Platform support
- Official project pages list builds for Linux, Windows, macOS, Android, embedded systems and set-top boxes. · sourceforge.net, 15 Oct 2026
- Praise: latency and broadcasting tests
- A SourceForge reviewer reports using iperf2 to compare TCP and UDP latency for video broadcasting and calls it a strong choice. · sourceforge.net, 15 Oct 2026
- Praise: multicast and high-capacity testing
- SourceForge reviewers describe it as a must-have for multicast testing and effective for checking bandwidth on high-capacity links. · sourceforge.net, 15 Oct 2026
- Project origin date
- SourceForge records the iperf2 project as registered on February 6, 2014. · sourceforge.net, 15 Oct 2026
Where iperf2 stands on Freedom251
- Network Diagnostic Software#2 of 37