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Your ROS_IP isn't set correctly. On each machine, make sure it's set to the IP address of that machine.

rostopic list uses the ROS_MASTER_URI to talk to the ROS master and get the list of topics. rostopic echo uses the ROS_MASTER_URI to look up the publisher and then contacts that publisher based on its ROS_IP (or ROS_HOSTNAME).

I gave a talk about troubleshooting network issues at ROSCon 2013 if you'd like a more in-depth overview: video and slides.