I have a question at this point: when you run two Factorio servers at one host, who or what decides which will receive which packet when the incoming packet is for the same target port? Is that be done by the operating system? I mean: there must be something “above” the two Factorio servers, which ...

I still think this is simple port forwarding inside of a kubernetes cluster or similar or Docker can do this meanwhile itself. Nothing which needs to be part of Factorio. To expand on what I said earlier in the thread, these are both solutions for running multiple servers on the same host, listenin...

The docker container can put the two instances on different ports, but it can't make them both share the same ip and port.