Belkin N1 User Manual page 58

Using the Web-Based Advanced User Interface
Configuring Internal Forwarding Settings
The Virtual Servers function will allow you to route external (Internet)
calls for services such as a web server (port 80), FTP server (Port 21),
or other applications through your Router to your internal network.
Since your internal computers are protected by a firewall, computers
outside your network (over the Internet) cannot get to them because
they cannot be "seen". A list of common applications has been
provided in case you need to configure the Virtual Server function
for a specific application. If your application is not listed, you will
need to contact the application vendor to find out which port settings
you need
Choosing an Application
Select your application from the drop-down list. Click "Add". The
settings will be transferred to the next available space in the screen.
Click "Apply Changes" to save the setting for that application. To
remove an application, select the number of the row that you want to
remove then click "Clear".
Manually Entering Settings into the Virtual Server
To manually enter settings, enter the IP address in the space provided
for the internal (server) machine, the port(s) required to pass (use a
comma between multiple ports), select the port type (TCP or UDP),
and click "Apply Changes". You can only pass one port per internal IP
address. Opening ports in your firewall can pose a security risk. You
can enable and disable settings very quickly. It is recommended that
you disable the settings when you are not using a specific application.
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