DynDNS setup guide

Set up DynDNS on OPNsense

The os-ddclient plugin keeps your hostname in sync with your WAN IP — reliable and dual-stack ready.

OPNsense moved Dynamic DNS into the os-ddclient plugin. Its “custom” service speaks dyndns2 — exactly what the dremaxx endpoint expects. Install the plugin once and add your hostname.

Before you start: get your DynDNS credentials

Every DynDNS domain comes with its own username (the hostname itself) and a generated router password. You find both in the dremaxx console:

  1. Sign up for free and create a DynDNS domain — e.g. myhome.dxdns.de under a shared system domain, or under your own domain.
  2. Open the domain in the console — the “Router credentials” card shows username, password and the update URL.
  3. Enter those values below in place of the example hostname.
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Settings

Values to enter

OPNsense UI: System › Firmware › Plugins › install os-ddclient, then Services › Dynamic DNS › Settings › Add.

Service / providercustom
Serverwww.dremaxx.de
Path/api/dyn-dns/nic/update
Hostnamemyhome.dxdns.de
Usernamemyhome.dxdns.de
Password:The router password of your domain (from the console)

myhome.dxdns.de is an example — replace it with your own DynDNS domain from the console.

Step by step

Set it up

1
Install the plugin

Go to System › Firmware › Plugins and install os-ddclient. Reload the UI — Services › Dynamic DNS appears.

2
Add a new account

Under Services › Dynamic DNS › Settings click “+”. Choose the service “custom” and check “Enabled”.

3
Enter server, path and hostname

Set the server and path exactly as shown above, and enter your DynDNS hostname under “Hostname(s)”.

4
Enter username and password

Username is your full DynDNS hostname, the password is the router password from the console.

5
Choose the check method and save

Set “Check ip method” to a public IP check (e.g. web / dyndns). Save and apply — the first update is sent immediately.

Dual stack

IPv6 / dual-stack notes

For IPv6 add a second os-ddclient “custom” service with the IP version set to IPv6 — the AAAA record is then updated independently.
Check

Verify it works

After saving, your device sends its first update within seconds to a few minutes. Open the domain in the dremaxx console — the update history shows every request live, including the reported IPv4/IPv6 and its status. Alternatively, resolve your hostname (e.g. with our DNS lookup tool or dig) and compare it with your current public IP.

Note: one update per minute and address family is accepted per hostname. Identical re-announcements are answered with “nochg” — that is normal and not an error.

Ready to reach home from anywhere?

Create your first DynDNS hostname in minutes — free — and let your router do the rest.

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More devices

Other setup guides

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