D-Link DI-704 - Manual (Page 23)

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4.7 Special AP
Some applications require multiple connections, like Internet games, Video conferencing,
Internet telephony and so on. Due to the firewall function, these applications can not work
with a pure NAT router. Special Applications enables some of these applications to work
with a NAT router. If Special Applications is still insufficient to allow an application to
function correctly, try DMZ host in the Misc Items options.
1. Trigger: the outbound port number the application issued first.
2. Incoming Ports: when the trigger packet is detected, the inbound packets to the
specified port numbers are allowed to pass the firewall.
The DI-704 provides some predefined settings in the gray pad on the bottom of the web page.
Choose the Popular application and click Copy to copy the predefined setting.
Note! At any time, only one PC can use each Special Application tunnel.