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We are following the installation tutorial and are currently on the "Hello Robot." The problem we are facing is verifying our connection to the ROS Master. In the tutorial, it states that the ROS Master is the serial number on the baxter arm. When we attempt to ping to the ROS Master URI (serial number), we get unknown host. ________________________________________________________________________________________________ I.e. [intera - http://021xxxRPxxxxx.local:11311] user@ubuntu:~/ros_ws$ ping 021xxxRPxxxxx.local ping: unknown host 021xxxRPxxxxx.local _______________________________________________________________________________________________ Also we have successfully pinged to the controller with its serial number/IP address. Are we suppose to ping to the controller with its serial number or the arm itself?