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I think you've got the meaning of ROS_IP wrong. ROS_IP is to be set to each machine's ip, where a node is running. It is not something like ROS_MASTER_URI!

So, if you have machine a at 10.1.1.1 and machine b at 10.1.1.2, each node running on a must have ROS_IP 10.1.1.1 and each node on machine b ROS_IP 10.1.1.2. The reason is that machines need to be able to connect forth and back. That is why some connections work (in one direction), while others don't.

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