On Fri, Apr 12, 2019 at 12:42:12AM +0900, Mark Fletcher wrote: > > Why not use a dynamic DNS provider? > The problem is how I know that the IP > address has changed and hence the DNS mapping needs updating. By doing it correctly. <https://mywiki.wooledge.org/IpAddress> has an example for Debian. Specifically Debian 8 (jessie), but it should still work in newer releases.