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MultipleMachines

I had same problem while ı am trying the upper link. I resolved, resolve is here.

open the .bashrc files and add this code.

You'll see those things like that:

export ROS_MASTER_URI=http://localhost (or something like that which is not your ip):11311
export ROS_HOSTNAME=(your machine name)

and you must change it like that:

export ROS_MASTER_URI=http://30.10.21.46:11311
export ROS_HOSTNAME=30.10.21.46

change your ip adress.