DFS - I appreciate your efforts to help here, but what started as a simple request for help has morphed into a bottomless barrel! I have much work to do now to study IP6 addresses and how NAT works with them having only a sketchy understanding of how it works with IP4 - so you can see my problem.

Thanks for all you have done, but I am leaving this topic to go to school.

In reply to a post by DFScale:

If your external IP is on 100.x.y.z, then it is CGNAT and you don't have a public IP address. Do you mean it is different to your routers LAN ip address, which is private on IPv4?

I think you will need to go to the BQM guides to see what you can do with CGNAT, unless your ISP supports IPv6

https://www.thinkbroadband.com/tools/what-is-my-ip

This is the IP you're connecting to our website from. This won't be your router.. you need to find a router IP that is probably going to start with the same bits but end in :: or ::0 or ::1 or something like that usually. This is for IPv6

Then for IPv4 check if the IP from above page is also anywhere on your router. If you're on CGNAT as others said then you can't make IPv4 work as it's a shared IP. I can't see it here as you're connecting over IPv6 but above page should show it to you.

seb