Belkin High Performance Wireless VPN Router N300 - Manual (Page 80)

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advanced
Port Trigger
If you use Internet applications which use non-standard connections
or port numbers, you may find that they do not function correctly
because they are blocked by the Wireless Router’s firewall. A
Port Trigger will be required for these applications to work.
Port Trigger
enable Port Forwarding Check this box to Enable the Port Trigger feature.
Popular applications
This is a list of some common applications with preset settings.
Select the application and click add to automatically enter the settings.
Trigger port This is the outgoing (outbound) port numbers for this application.
Trigger type Select whether the application uses TCP, UDP or Both types of protocols for outbound transmissions.
Public Port These are the inbound (incoming) ports for this application.
Public type Select whether the application uses TCP, UDP or Both types of protocols for inbound transmissions.