Google Domains DDclient Dynamic DNS OPNsense

Earlier I wrote about setting up an OPNsense firewall. As I’m using Google Domains, I wanted to use their DDNS service and have OPNsense control it. Here’s how!

Google Domains DDclient Dynamic DNS OPNsense

In the Google Domains dashboard, switch to DNS settings:

Scroll all down and click Advanced Settings:

Manage Dynamic DNS:

Give your subdomain a name, and continue with the steps. In my example, I have chosen home.giese.cloud:

This is displayed in the overview, too:

In OPNsense, go System / Firmware / Plugins and select os-ddclient (do not select os-dyndns). Use Google as a service, your subdomain as hostname, and the credentials taken from the Google Domains dashboard. Also, choose a service to monitor your IP address, like ip4only.me in the example below, and choose an interface to monitor:

OPNsense DDclient Google Domain Settings

And, surprise, that was it! Verify that the IP shown in Google Domains is the same as in https://www.whatismyip.com.
To be absolutely sure that it works, reconnect the internet to trigger a new IP and verify again.
Sorted! Short and sweet!