ddclient is used for dynamic DNS updates over http.

Install without the configuration dialog.

apt install -y ddclient

systemctl stop ddclient

Generic dyndns2 protocol server configuration.

daemon=3600
foreground=no
protocol=dyndns2
use=web, web=freedns
login=XXX
password=XXX
server=example.com
script=/
ssl=yes
hostname.example.com

This requires port forwarding on the router to access internal services.

daemon=3600
foreground=no
protocol=dyndns2
login=XXX
password=XXX
server=example.com
script=/
ssl=yes
usev6=ifv6, ifv6=eth0, usev4=disabled
hostname.example.com

This requires IPV6 pin-holing on the router to access internal services.

systemctl start ddclient

When using Collabora with Nextcloud office a WOPI allow list must be configured to allow access from Collabora to Nextcloud to access files.

When using IPv4 this can be fixed but for IPv6 this may be dynamic.

The addition of the postscript option to ddclient will run an external script on IPv6 address change of the local host machine.

postscript=/usr/local/bin/wopi_allowlist

This script will update the allow list.

#! /bin/bash
IPADDR=$1
if test -z "$IPADDR"; then
        echo "try: wopi_allowlist IPADDR"
        exit 1
fi
cd /var/www/htdocs/hostname.example.com
sudo -u www-data php occ config:app:set richdocuments wopi_allowlist --value "$IPADDR" 2>&1 1>/dev/null