Matrix NAVAN CNX200, System Manual

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280 Matrix NAVAN CNX200 System Manual
Port Triggering
Port Triggering is quite similar to Port Forwarding; with the exception that it allows you to configure port forwarding
on-demand. Port triggering “triggers” to open an incoming port when an internal host on the local network makes an
outgoing connection to a predetermined port. It allows only one internal host on the network to use a particular
service that occupies a particular port.
Port Triggering does not forward any traffic to an internal host until that internal host has initiated some form of
traffic for an external destination. When that occurs, the Port Triggering mechanism automatically allows traffic to
be forwarded to the internal host that initiated the trigger condition.
Port Triggering is more secure than Port Forwarding, because the incoming ports are not open all the time, they
open only when a program is actively using the trigger port.
Port Forwarding has higher priority than Port Triggering.
Let us consider the example of a Gaming Application.