Belkin F5D7230-4 Manuel De L'utilisateur page 67

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. You will need to contact the application vendor
to find out which port settings you need.
Entering Settings into the Virtual Server
To enter settings, enter the IP address in the space provided for the internal
(server) machine, and the port(s) required to pass. Then select the port type
(TCP or UDP), check the "Enable" box, and click "Apply Changes". Each
inbound port entry has two fields with five characters maximum per field that
allows a start and end port range, e.g. [xxxxx]-[xxxxx]. For each entry, you
can enter a single port value by filling in the two fields with the same value
(e.g. [7500]-[7500]) or a wide range of ports (e.g. [7500]-[9000]). If you need
multiple single port values or a combination of ranges and a single value, you
must use multiple entries up to the maximum of 20 entries (e.g. 1. [7500]-
[7500], 2. [8023]-[8023], 3. [9000]-[9000]). 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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