D-Link DI-704UP - Manual (Page 33)

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Using the Configuration Menu (continued)
Advanced > Application
Some applications require multiple connections, such as Internet gaming, video
conferencing, and Internet telephony. These applications have difficulty working through
NAT (Network Address Translation). Special Applications makes some of these
applications work with the DI-704UP. If you need to run applications that require multiple
connections, specify the port normally associated with an application in the Trigger
Ports field, then enter the public ports associated with the trigger port into the Public
Ports field.