An absolute mammoth post about how I am running this blog site from a Google Pixel 5 Android phone using only Termux. It includes what inspired me, what I'm using for the setup, and my longform notes on the entire project.
Because CGNAT means that their router does not have a public IP - just like your router has a single IP that is shared between your devices (using NAT), their ISP shares an IP between multiple customers (also using NAT, it’s just called carrier-grade NAT to differentiate who is doing it).
The ISP gives their modem/router an internal IP and routes traffic through their datacenter to them and other customers via one shared public address. Also IPv6 is not always an option, I had to activate it on my ISP’s website but it was useless in the end because I can’t get an IPv6 address on my phone
Not with CGNAT
His Router should have a publicly reachable IP, otherwise he wouldn’t receive packages, right? Why would CGNAT keep him from using that?
Because CGNAT means that their router does not have a public IP - just like your router has a single IP that is shared between your devices (using NAT), their ISP shares an IP between multiple customers (also using NAT, it’s just called carrier-grade NAT to differentiate who is doing it).
So their “public facing IP” is an internal one? Even the v6 one?
The ISP gives their modem/router an internal IP and routes traffic through their datacenter to them and other customers via one shared public address. Also IPv6 is not always an option, I had to activate it on my ISP’s website but it was useless in the end because I can’t get an IPv6 address on my phone
It is shared between many different devices.
It is typical something like double or triple NAT