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Oscar Marion

Manually trigger DDNS update on a UDM Pro

Aug 19, 2023 · 1 minutes read

Dynamic DNS updates on the UDM Pro get triggered whenever your WAN IP address changes. But what if you need to trigger an update yourself?

I ran into this issue today, and to my surprise, there is no way of doing that from the Unifi Dashboard. While most of the responses you will find on Ubiquiti’s forums and on Reddit suggest restarting the console altogether, u/TheFuer on Reddit posted a much better way to do it, using the CLI.

First, connect to your UDM Pro via SSH. You can follow this guide if you don’t have it setup yet.

1. Determine the config/command that the UDM is using by typing this command:

$ ps aux | grep inadyn

It should return something similar to this:

root        1432  0.0  0.0   6336  3256 ?        S    00:49   0:00 /usr/sbin/inadyn -n -s -C -f /run/ddns-eth8-inadyn.conf
root       24298  0.0  0.0   4924   680 pts/0    S+   01:00   0:00 grep --color inadyn

2. Run inadyn with a force flag to force the update. Replace The path with the one the previous command returned:

$ inadyn -n -1 --force -f /run/ddns-eth8-inadyn.conf

You should get the following once the update is successful:

inadyn[25647]: In-a-dyn version 2.9.1 -- Dynamic DNS update client.

inadyn[25647]: Update forced for alias all.dnsomatic.com, new IP# XXX.XXX.XXX.XXX

inadyn[25647]: Updating cache for all.dnsomatic.com