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4-8 Special Applications
Some applications use multiple TCP/UDP ports to transmit data. With NAT enabled, these applications cannot work with the router. Port Triggering allows some of these
applications to work properly. Note that only one PC can use each Port Triggering setting at any time.
• Application name: Enter the name of the application you wish to configure.
• Outgoing Port Range: Enter the port number or range numbers this application uses when it sends outbound packets. The Outgoing Control Port Numbers act as
the trigger. When the router detects the outgoing packets with these port numbers, it will allow the inbound packets with the Incoming Port Numbers that you set in
the next column to pass through the router.
• Incoming Control: Enter the port number or range numbers the inbound packets carry.
Click the "Apply" button after making any changes, or click the "Cancel" button to exit the screen without saving any changes.
The following is a list of port numbers used on some popular applications:
4-9 DMZ Host
The DMZ Host application allows unrestricted 2-way communication between a single LAN PC and other internet users or servers. This application is useful for supporting
special-purpose services such as video-conferencing and gaming, that require proprietary client software and/or 2-way user communication.
To use this application, you must first obtain a fixed Public IP Address from your ISP.
Note that in order to provide unrestricted access, the Firewall provided by the router to protect this port is disabled, thus creating a potentially serious security risk.
It is recommended that this application is disabled when it is not in use by entering "0" in the "DMZ Host" field.
The Multi DMZ allows you to map the public IP addresses to your LAN PCs, should you get more than one public IP address from your ISP. This function is useful to set up
your servers, such as an FTP server, web server, and so on, with public IP addresses, but still keep them within your LAN group.
With the public IP addresses, Internet users will access your servers more easily and those servers can still communicate with other PCs in you LAN by using Network
Neighbourhood.
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Figure 32. Special Applications
Figure 33. Popular Application Port Numbers
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