CGNAT is both amazing and shocking. Amazing in that it kinda works. And shocking because the average person will never know why their shit is broken.
For me it broke online gaming. Luckily my ISP simply gives a static-ish IP to anyone who has an issue with CGNAT. But some ISPs force you to pay for a static IP, and some don’t even offer static IPs. I mean, I’d pay, but soon that won’t even be an option. It’s scary.
For me 2023 is exactly like 2003 from this point of view: a dynamic DNS account with inadyn/ddclient to refresh it when the IP changes, and it's almost like having a static IP.
Even better if you have e.g. a Linode or any server with a public IP that can run Wireguard or OpenVPN. Then you can run your own VPN server, configure your DNS, and connect to anything from anywhere.
Yggdrasil (https://yggdrasil-network.github.io/) is also another interesting IPv6-based solution - I have played with it a bit, but I still prefer to use my VPN, and do nginx reverse proxy from my Linode to my network over VPN when needed.
For me it broke online gaming. Luckily my ISP simply gives a static-ish IP to anyone who has an issue with CGNAT. But some ISPs force you to pay for a static IP, and some don’t even offer static IPs. I mean, I’d pay, but soon that won’t even be an option. It’s scary.