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The port numbers for publishers and subscribers are determined dynamically at runtime; settings up rules to prioritize this traffic will be tricky.

Note that rosnode info on the subscribing node shows the port and IP that it's connected to; in your case a rosnode info ladybug_viewer should give you the port number.

If you're trying to improve the performance of a video stream, have you looked at the image_transport_plugins stack?

If you're dead-set on setting up rules, I recommend that you do so dynamically. You'll probably have to use the Master API to make XML-RPC calls to the ROS master to determine the publisher URI.