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You need to make sure that you can ping the hostname of each machine in both directions.

e.g. when your master is pc1 and the other machine is lap1, you need to be able to ping pc1 from lap1 and lap1 from pc1.

It needs to work in both directions and it needs to be able to ping the hostnames not just the ips. If that isn't the case you can set the ROS_IP environment variables.

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