Load Balancer - Listener Configuration
A listener is a process that checks for connection requests. It is configured with a protocol and a port for front-end (client to load balancer) connections, and a protocol and a port for back-end (load balancer to back-end instance) connections. To add a new Listener, click on Add Listener.
For each listener you have the fields:
LB Protocol: Which protocol will your Load Balancer listening to
LB Port: Which port will your Load Balancer listening to
Instance Protocol: For which instance protocol will your Load Balancer transfer the traffic.
Instance Port: For which instance port will your Load Balancer transfer the traffic.