Download, verify and install with confidence.

Follow the official steps for Lemoa iperf3 1.0.1 on 64-bit Windows 10 or Windows 11.

1. Use the official download

Download only from lemoaconnect.com. Choose the installer for normal desktop integration, or the portable ZIP when you prefer an extracted folder with no installation.

2. Verify the SHA-256 hash

Open PowerShell in the download folder and run:

Get-FileHash .\Lemoa-iperf3-Setup-1.0.1-x64.exe -Algorithm SHA256

The installer result must be:

3c01e98de039304746b373438e262bfe23bf12783dc423169c86db17674c2300

For the portable ZIP, the SHA-256 value is:

7de29c5fb46550540a6184240534d67b817bab4f27f68f9d7460a6804b96cc1d

If a value differs, do not open the file. Delete it and download a fresh copy from this website.

3. Install or extract

Installer

Open Lemoa-iperf3-Setup-1.0.1-x64.exe and follow the setup prompts. Windows requests administrator approval during installation and again when the elevated application is launched.

Portable ZIP

Use Extract All, open the extracted LemoaIperf3 folder, and run LemoaIperf3.exe. Keep the _internal folder beside the executable.

4. Understand the Windows warning

Unsigned release disclosure: Version 1.0.1 does not currently carry a commercial Authenticode signature. Windows SmartScreen may therefore show an unknown-publisher or reputation warning. Confirm the HTTPS website address and matching SHA-256 hash before deciding whether to proceed. If you are not comfortable with an unsigned release, do not install it.

5. Server firewall behavior

Client mode does not need an inbound firewall rule. When you start server mode, the app requests administrator approval to create a narrowly scoped temporary Windows Private-network rule for TCP or UDP port 5201. The app removes its tagged rule when the server stops; uninstall also removes installed rules.

Use server mode only on a trusted network. Do not expose port 5201 directly to the public internet unless you understand and intentionally control that access.

6. First test

Open Lemoa iperf3 on the server computer and select the correct interface.
Start server mode and note the displayed IPv4 address.
On the second device, open an iperf3 client and enter that address on port 5201.
Run TCP first, then use reverse, bidirectional or UDP only when the test requires them.
Interpret the result as path throughput between those two endpoints—not as an internet speed test.

7. Install on Ubuntu or Debian

Download lemoa-iperf3_1.0.1_all.deb.
Open the Downloads folder and double-click the package.
Select Install in App Center or Software Install and authenticate.
The package manager installs Python/Tk, iperf3, PolicyKit and UFW automatically when required.
Open Lemoa iperf3 from the applications menu.

Linux firewall note: Server mode adds only a temporary TCP 5201 rule on the selected interface and removes it when stopped. It does not enable or reconfigure an inactive firewall automatically.

Linux package SHA-256:

02f8bb4b00f290b492f05b56272c68cd3b0f43bbf692b764e72d02d35fc6da02

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