Just a regular Joe.
Welcome to the world of Carrier Grade NAT. 100.64.0.0/10 is reserved for this.
If you are lucky, you also have an IPv6 address. The catch is you need IPv6 on the client-side too.
A VPS or similar running wireguard and a proxy might bridge the gap.
It might also be possible to ask your provider for some port forwarding. Probably not, but check anyway.
Good luck!
Dynamic DNS is probably still required, unless his ISP issues dedicated or very long term IPv6 leases.
IPv6 may also “just work” nowadays, too, especially if the aim is to connect from mobile or other consumer networks. Corporate environments are still hit & mostly miss.
Go go TinyLinux. Booting Linux from DOS was great for newbie me. ;-)
Not my experience with Arch at all, but I stick to pretty standard hardware.
What I like with Arch is that it gets out of my way and makes it easy to have a minimal desktop experience. I’ve been a Linux user since '95, so I have a pretty good idea of what I want out of a distro. When there have been issues, the wiki has been excellent.
I update regularly, but not constantly. I tend to hold back kernel & driver updates until I’m ready to reboot. Pretty chill experience all around.
Still a good bot. pats diodes