Belkin F1PI210ENau User Manual page 24

Advanced Setup Method
Address Mapping
Use Address Mapping to allow a limited number of public IP
addresses to be translated into multiple private IP addresses for use
on the internal LAN network. This also hides the internal network for
increased privacy and security.
Port Forwarding
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Advanced Setup Method
Using this feature, you can put PCs with public IPs and PCs with
private IPs in the same LAN area.
If you configure the Port Forwarding settings, remote users accessing
services such as web or FTP at your local site via public IP addresses
can be automatically redirected to local servers configured with
private IP addresses. In other words, depending on the requested
service (TCP/UDP port number), the VoIP Router redirects the external
service request to the appropriate server (located at another internal
IP address).
For example, if you set Type/Public Port to TCP/80 (HTTP or web)
and the LAN IP Address/LAN Port to 10.1.1.2/80, then all HTTP
requests from outside users will be transferred to 10.1.1.2 on port
80. Therefore, by just entering the IP address provided by the ISP,
Internet users can access the service they need at the local address
to which you redirect them.
There is a list of commonly used applications and their associated
port(s), to add an application to the Port Forwarding list simply select
the desired application and click "Add".
The more common TCP service ports include:
HTTP: 80, FTP: 21, Telnet: 23, and POP3: 110.
Special Applications
Some applications, such as Internet gaming, video conferencing,
Internet telephony and others, require multiple connections. These
applications cannot work with Network Address Translation (NAT)
enabled. If you need to run applications that require multiple
connections, use the following screen to specify the additional public
ports to be opened for each application.
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