Airlink101 AR420W - Manual (Page 29)

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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 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 setting.