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roscore defaults to use port 11311. If you use the environment variable ROS_MASTER_URI (documented here ) to change that port the 2nd master won't conflict.

You can also run multiple gazebo instances inside ROS if you launch them in different namespaces. However there may be an issue if you try to run them on the same machine and the instances have to share a GPU. Running them on 2 seperate machines will definitely avoid that.

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