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There is no "ROS" network. ROS doesn't explicitly associate with a specific network, but leverages the IP routing on your host system. If you're setting things up in a container. You just need to make sure that the addresses that you're using are routable on all the systems in both directions and then it should work.

If you're using multiple networks you may need to setup appropriate routing rules to connect the networks appropriately. There are built in linux tools as well as most container infrastructure provide network configuration tools that you can use to make sure that the addresses are routeable.