Duck DNS - install
https://www.duckdns.org/install.jsp?tab=synology&domain=im0823config service "duckdns" option enabled "1" option domain "exampledomain.duckdns.org" option username "exampledomain" option password "a7c4d0ad-114e-40ef-ba1d-d217904a50f2" option ip_source "network" option ip_network "wan" option force_interval "72" option force_unit "hours" option check_interval "10" option check_ ...