Airlink101 300N - Manual (Page 35)

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6.5.2 Port Range Triggering
Port triggering allows the router to keep track of outgoing data for specific port numbers.
The router remembers which computer sends out what data, so that when the
requested data returns through the router, the data is sent back to the proper computer
by way of IP address and port mapping rules.
Click Apply and OK to save the settings.