[chaley]

Originally Posted by Saxguy

I think ducks has picked up my current IP. Not sure how to watch for IP change?

This is done by the client. See https://duckdns.org/install.jsp

I have looked at port forwarding, and not sure how to do this.

This is done in your home router. Exactly how this is done depends on your router, but it is probably under some section talking about firewall rules. Typically you enter the external port to monitor, the IP address of the computer to receive packets (the computer running calibre) and the port number of the program on the receiving computer (the content server port). There is probably a support forum for your router if you can't figure it out from the manual.

I’m pretty sure the PC has a fixed IP. But, is that when you make a DHCP reservation using MAC address?

A DHCP reservation gives you the equivalent of a fixed IP address.

If I cant use the URL inside the home network, is there any way of testing it without resorting to going back and forth …. I mean whilst on the home network. ?

You can test it only from outside your home network. Probably the easiest way to do this is to use a phone with a wireless data plan, turning off its WiFi so it is forced to connect through your phone's provider.