If you want to change the interval, go to “General Settings” and update the interval. The DNS entry will be updated every 5 minutes. Hostname: full domain name you want to update (e.g.

Password: Global API key for your account (Open Cloudflare > My Account > API Tokens > Global API Key > View).

Username: E-Mail address of your account.

Within OPNsense, go to “Services > Dynamic DNS > Settings” and add a new dynamic DNS configuration and enter the values that fit your configuration: In this example, I will add an A record with IP 0.0.0.0 (choose whatever you want), deactivated proxy and TTL of 5 minutes. Go to Cloudflare and add the DNS entry that should be set by ddclient. Once it is installed you can find “Dynamic DNS” under services.

Open OPNsense admin panel and go to “System > Firmware > Plugins” and select os-ddclient (do not use os-dyndns as it is outdated and will no longer be supported). Step 1: Install ddclient dynamic DNS plugin This blog post is the summary of the research. Configuring Cloudflare also did not work that well in the beginning, but after some research, it worked. In my case, I had to switch from Azure DNS to Cloudflare because ddclient doesn’t support Azure DNS. Few months ago, OPNsense decided to switch from dyndns (os-dyndns) to DDclient (os-ddclient) and it seems some users, including me, have issues with switching from legacy one to new one. OPNsense is a great open source firewall with lots of plugins and support for wireguard, dynamic DNS and many other.

Opnsense dynamic dns