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I have my system set up with names instead of IP addresses. My /etc/hosts files have the IP addresses of both machines in both files. Then I just set ROS_MASTER_URI=http://hostname:11311, and not ROS_IP.

I think if you're using ROS_IP, each machine needs it set to it's own IP. (Did you set both machines' ROS_IP to the master's IP?)

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