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I the set ROS_MASTER_URI=http://10.0.0.6" and while the talker works, the listener does not hear any messages. How can I get this to work?

Just a guess, but probably by setting ROS_MASTER_URI to http://10.0.0.6:11311 (note the port)?

I the set ROS_MASTER_URI=http://10.0.0.6" and while the talker works, the listener does not hear any messages. How can I get this to work?

Just a guess, but probably by setting ROS_MASTER_URI to http://10.0.0.6:11311 (note the port)?port), and by either providing a working DNS (entry) for all the involved machines, or by setting ROS_IP to the correct values.