Easy and free Dynamic DNS

The nasty need for dynamic DNS.

For a while now I’ve been maintaining a couple of 4G/5G enabled out of band devices. These devices are used to provide access to serial consoles of network devices. Why you ask? Well, sometimes a configuration error or something else causes the normal access paths to be unavailable. Who hasn’t made a L2 loop by accident…

I call these devices “last resort”. They provide a last resort access to my network when everything else fails, and they use 4G/5G for connectivity. The downside? They don’t have a fixed IP address, quite often the IPs change. For most cases this is fine because I have reverse tunnels, but I still want to access them in case those fail. But for that to work I need to know 1 crucial thing: its IP address on the internet.