Thank you for your help, As you suggested, here is my post on answer.ros.org : http://answers.ros.org/question/647/nodes-with-2-computers?answer=1117#1117 On Apr 7, 2011, at 7:20 PM, Adam Leeper wrote: This is probably more of a answers.ros.org question, but I think you also need to tell computer A how to refer to itself, e.g. export ROS_HOSTNAME=192.168.1.100 on computer A. ? --Adam Adam Leeper Stanford University aleeper@stanford.edu 719.358.3804 On Thu, Apr 7, 2011 at 5:12 PM, Morgan Cormier > wrote: Hi, I am trying to make a node on one computer(computer A) with some publishers and some services and try to read the messages and call some services with another computer(computer B). computer A(ip is 192.168.1.100) and computer B(ip is 192.168.1.101) are connected since they can ping each other computer A also runs a roscore since it is the master on computer A, I set the ROS_MASTER_URI at http://localhost:11311 on computer B, I set the ROS_MASTER_URI at http://192.168.1.100:11311 and the ROS_HOSTNAME at 192.168.1.101 and yet it doesn't work, I don't even receive the topics messages, I am sure I am doing something wrong or maybe didn't configure my network properly. Does someone happen to know how to solve the problem? Thank you so much for your help. _______________________________________________ ros-users mailing list ros-users@code.ros.org https://code.ros.org/mailman/listinfo/ros-users