Perform a speed test on Synology NAS

This guide explains how to perform a speed/iperf test in CLI between your computer and your Synology NAS. Speed tests can be useful to determine the download and upload speeds of the Internet connection to the Synology NAS.

Configure the Speed Test

1. Install the SynoCli Monitor Tools Package

1. On the DSM interface, go to the Package Center
2. Click on the Settings button in the taskbar, then go to the Package Sources tab
3. Click on the Add button
4. Enter Name: SynoCommunity
5. Enter Location: https://packages.synocommunity.com/
6. Confirm both windows by clicking the OK button
7. Then go to the Community tab in the left menu that has been added
8. Install the package: SynoCli Monitor Tools

2. Open SSH Connection

1. Go to the Control Panel of the DSM interface
2. Click on the Terminal & SNMP tab in the left menu
3. Check the box "Enable SSH service" on the right side of the screen
4. Confirm by clicking the Apply button
5. If you do not need the SSH connection, you can uncheck this box at the end of the test

3. Start iperf Server

1. On your computer, open the console (Terminal on macOS, Shell on Linux, PowerShell/Command Prompt on Windows)
2. Run the command: ssh dsm_username@ip_syno
3. Enter your user password and press Enter
4. Once connected via SSH, run the command iperf3 -s

4. Start the Test

1. On your computer, download the iperf3 client from the official website
2. Open a new console
3. Navigate to the folder where you downloaded the iperf3 executable
4. Run the command iperf3 -c ip_syno
5. The test results will be displayed after a few seconds, showing the upload and download bandwidth between your Synology NAS and your computer