title: how managed servers listen to each other in server cluster
body: <p>when configuring oracle fusion middleware, in the screen for 'managed cluster servers' user has to enter managed server name and listening port. how it's working on a cluster, is the server listening on the port of the given ip address, if it's so it's confusing to think how one server is listening to a external machine. for example serverA listens on ServerB port 20 and whenever serverB sends data through port 20, serverA has to pick them up!  in that case ServerA has a listener on external machines port, is it possible? </p>