This guide explains how to configure ddclient, a tool available on most Linux distributions (❓: help), to use it with the DynDNS service from Infomaniak.

Prerequisites

• The ddclient package must be installed on your system (e.g., sudo apt install ddclient).
• A dynamic DNS record must have been created for the domain in question via the Infomaniak Manager (❓: help).
• Check that the SSL module for Perl is installed: sudo apt install libio-socket-ssl-perl.

ddclient configuration

The configuration file /etc/ddclient.conf must contain the following information:

protocol=dyndns2
ssl=yes
use=web
server=infomaniak.com
login=enter_your_login
password=enter_your_password
yourdomain.xyz

• ssl=yes: enables a secure connection. This parameter is mandatory for the update to function correctly.
• use=web: instructs ddclient to use an external service to automatically detect your public IP address.
• login / password: DynDNS credentials defined in the Infomaniak Manager when adding the Dynamic DNS (❓: help).
• yourdomain.xyz: replace this with your domain or DynDNS subdomain.

Test and verification

Before launching ddclient as a service, you can test the configuration with:

sudo ddclient -daemon=0 -verbose -debug

If the configuration is correct, you will see a message such as SUCCESS: updating yourdomain.xyz.

Starting the service

Once the configuration is validated, restart and activate ddclient:

sudo systemctl restart ddclient
sudo systemctl enable ddclient

You can check its status with:

sudo systemctl status ddclient

But also:

• Protect the configuration file with: sudo chmod 600 /etc/ddclient.conf.
• Regularly check that the IP address is being updated correctly by performing a DNS lookup (dig yourdomain.xyz or nslookup).
• If your IP address does not change frequently, keep a reasonable refresh interval to avoid unnecessary requests.