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Port Triggering

Port triggering is a dynamic extension of port forwarding that is useful in these cases:

More than one local computer needs port forwarding for the same application (but not 

simultaneously).

An application needs to open incoming ports that are different from the outgoing port.

When port triggering is enabled, the router monitors outbound traffic looking for a specified 
outbound “trigger” port. When the router detects outbound traffic on that port, it remembers 
the IP address of the local computer that sent the data. The router then temporarily opens the 
specified incoming port or ports, and forwards incoming traffic on the triggered ports to the 
triggering computer. 

While port forwarding creates a static mapping of a port number or range to a single local 
computer, port triggering can dynamically open ports to any computer that needs them and 
can close the ports when they are no longer needed.

If you use applications such as multiplayer gaming, peer-to-peer 

connections, real-time communications such as instant messaging, 
or remote assistance (a feature in Windows XP), you should also 
enable Universal Plug and Play (UPnP) according to the instructions 
in 

To configure port triggering, you need to know which inbound ports the application needs. 
Also, you need to know the number of the outbound port that will trigger the opening of the 
inbound ports. You can usually determine this information by contacting the publisher of the 
application or user groups or newsgroups.