This guide explains how to perform an online speed test from the command line (iPerf CLI) between your computer and your Synology NAS. These tests can help you evaluate the download and upload speeds of your Internet connection to and from your NAS.

Configuration of the Speedtest tool

To install the SynoCli Monitor Tools package:

1. From the DSM interface, go to the Package Manager.
2. Click the Settings button in the taskbar, then go to the Package Source tab.
3. Click the Add button.
4. Fill in the fields as follows:
   • Name: SynoCommunity
   • Location: https://packages.synocommunity.com/
5. Confirm both windows by clicking OK.
6. A new tab titled Community will appear in the left menu.
7. Select it, then install the SynoCli Monitor Tools package.

Activation of the SSH connection

To activate the SSH service:

1. In the DSM interface, open the Control Panel.
2. Click on the Terminal & SNMP tab in the left menu.
3. Check the box Enable SSH service.
4. Click Apply to confirm.
   • If you no longer need the SSH connection after the test, you can uncheck this box to disable the service.

Starting the iPerf server

To connect to the NAS via SSH, from a Terminal type application (command line interface, CLI / Command Line Interface) on your device:

1. Run the following command:

   ssh nom_utilisateur_dsm@ip_du_synology

2. Enter the password for your DSM account, then validate with the Enter key.

3. Once connected via SSH, start the iPerf server with the following command:

   iperf3 -s

Starting the speed test

To download and run the iPerf3 client:

1. Download the iPerf3 executable for your operating system from the official site.
2. Open a new console.
3. Navigate to the folder where the iPerf3 executable is located.

4. Run the following command:

   iperf3 -c ip_du_synology

5. The test results will be displayed after a few seconds. You will then be able to view the upload and download bandwidth between your computer and your Synology NAS.