Beat CGNAT with a VPS reverse tunnel
CGNAT leaves you with no public IP. Put frp on a cheap VPS, dial the tunnel out from home, and terminate HTTPS on the public end with a real certificate.
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iptables vs nftables on Ubuntu
On Ubuntu the iptables command already writes nftables rules. Prove it on your box, read the native ruleset, and see where ufw and Docker collide.