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Special Applications
Some applications, such as Internet gaming, videoconferencing, Internet 
telephony and others, require multiple connections. These applications 
cannot work with Network Address Translation (NAT) enabled. If you 
need to run applications that require multiple connections, use the 
following screen to specify the additional public ports to be opened for 
each application.
Click the List of well known special applications link for more 
information.
Specify the public port number normally associated with an application in 
the Trigger Port field. Set the protocol type to TCP or UDP, then enter 
the ports that the application requires. The ports may be in the format of a 
single port, or in a range, e.g., 72-96, or a combination of both.