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Chapter 3: Advanced Configuration
44
Port Triggers Web Page
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 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.29
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 Range the range of destination ports your game will be sending to, and
entering into Target Range 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 (see Advanced...Forwarding discussion above). 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.