X5821 User's Manual
Version 1.0
4.3.2 Port Triggering
Some applications require that specific ports in the Router's firewall
be opened for access by the remote parties. Port Trigger dynamically
opens up the '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.
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