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this is the second time I've seen a post like this.
docker has always been like this. if it's news to you then you must be new to docker.
if you're using the built in firewall to secure your system on your wan, you're doing it wrong. get a physical firewall. if you're doing it to secure your lan then you just need to put in some proper routes and let your hardware firewall sort it out with some vlans.
don't rely on firewalld or iptables for anything.
What if you rent a bare metal server in a data center? Or rent a VPS from a basic provider that expects you to do your own firewalling? Or run your home lab docker host on the same vlan as other less trusted hosts?
It would be nice if there was a reliable way to run a firewall on the same host that’s running docker.
You may say these are obscure use cases and that they are Wrong and Bad. Maybe you’re right, but personally I think it’s an unfortunate gap in expected functionality, if for no other reason than defense-in-depth.
Install proxmox and use its SDN/FW features?