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6. Port Triggers
Some Internet activities, such as interactive gaming, require that a PC on the WAN side of your gateway
be able to originate connections during the game with your game playing PC on the LAN side. You could
use the Advanced-Forwarding web page to construct a forwarding rule during the game, and then remove
it afterwards (to restore full protection to your LAN PC) to facilitate this. Port triggering is an elegant
mechanism that does this work for you, each time you play the game.
Fig. 2-20 Advanced\Port Triggers
Port Triggering works as follows. Imagine you want to play a particular game with PCs somewhere on
the Internet. You make one time effort to set up a Port Trigger for that game, by entering into Trigger
Start Port and Tigger End Port the range of destination ports your game will be sending to, and
entering into Target Start Port the range of destination ports the other player (on the WAN side) will be
sending to (ports your PC’s game receives on). Application programs like games publish this information
in user manuals. Later, each time you play the game, the gateway automatically creates the forwarding
rule necessary. This rule is valid until 10 minutes after it sees game activity stop. After 10 minutes, the
rule becomes inactive until the next matched outgoing traffic arrives.
e.g., suppose you specify Trigger Range from 6660 to 6670 and Target Range from 113 to 113. An
outbound packet arrives at the gateway with your game-playing PC source IP address 192.168.0.10,
destination port 666 over TCP/IP. This destination port is within the Trigger destined for port 113 to your
game-playing PC at 192.168.0.10.
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