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Docker docs:
Docker routes container traffic in the nat table, which means that packets are diverted before it reaches the INPUT and OUTPUT chains that ufw uses. Packets are routed before the firewall rules can be applied, effectively ignoring your firewall configuration.
I've been playing with systemd-nspawn for my containers recently, and I've been enjoying it!
Try podman and quadlets
Quadlets are so good.
What advantage does it have over nspawn?
Docker does not play fair, does not play nice. It’s a dozer that plow through everything for devops that yolo and rush to production.
Well yea ofc it works like that, the services are not on the same network, so the packets need to be sent onto another adapter. That means either nat or forwarding tables.
Now if that was a good design of docker is another question.
Wait, that's illegal