About IP Address and Ports
When using the Advanced Clustering plugin, nodes send notifications to each other to improve performance. This is especially important if using the Guarantee Message Order option on any channels.
To enable nodes to receive notifications, you must specify the IP address of each node, as well as the port that each node should listen for notifications on. The IP address is automatically populated with a "best guess," but you may need to manually change it if the value is not correct. The port is set to "10000" by default, but you can change it to any other port number.
To disable receiving notifications on a node, set its port to a blank value. This will lead to decreased performance.