Comtrend Corporation AR-5389, User Manual

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Field/Header Description
Internal Port Start Enter the internal port starting number (when you select
Custom Server). When a service is selected the port ranges
are automatically configured
Internal Port End Enter the internal port ending number (when you select
Custom Server). When a service is selected, the port ranges
are automatically configured.
5.5.2 Port Triggering
Some applications require that specific ports in the firewall be opened for access by
the remote parties. Port Triggers dynamically 'Open Ports' in the firewall when an
application on the LAN initiates a TCP/UDP connection to a remote party using the
'Triggering Ports'. The Router allows the remote party from the WAN side to
establish new connections back to the application on the LAN side using the 'Open
Ports'. A maximum 32 entries can be configured.
To add a Trigger Port, click Add. The following will be displayed.