How to communicate between the flightgear on the host and the simulator on the virtual machine

I want to link flightgear(mac) on host and simulator on virtual machine(ubuntu)

After executing “” on the host machine, “ -j4 --console” was executed on the virtual machine, but flightgear does not move even if you move the simulator with the command.
Where can I set communication when flightgear and the simulator are running in different environments?

In addition, we executed "output add ***.***.***.***:5503 "after simulator execution and sent data to the host PC.
At this time, we confirmed that the message was received from the virtual machine to the host PC with UDP reception tool. But flightgear did not respond at all.