custom ddns script to update ipv6 address
how to install
edit /etc.defaults/ddns_provider.conf
[SPDyn]
modulepath=/usr/syno/bin/ddns/spdyn.php
queryurl=https://spdyn.de/
copy the php script to /usr/syno/bin/ddns
make sure the script has execute permission
chmod +x /usr/syno/bin/ddns/spdyn.php