With port forwarding and port triggering data is forwarded to ports locally, remotely, and dynamically. To sidestep these concerns administrators use port forwarding and port triggering to allow end-users to connect. In theory, sending data from device to device is a simple concept, but what happens when you want to access a service remotely? Your ability to connect with internal networked devices is restricted by a firewall that has been designed to keep out unwanted intruders. Port triggering is considered to be dynamic because ports are opened when they are needed and closed when they aren’t in use. Port triggering is used by network administrators to map a port or ports to one local computer. Port triggering is a dynamic form of port forwarding used when port forwarding needs to reach multiple local computers. Port forwarding or port mapping is the name given to a technique of forwarding data from a port on one node to another node.
