Cisco Systems WRVS4400NRF manual Configuring Port Range Forwarding

Setting Up and Configuring the WRVS4400N Wireless-N Router	5
Configuring Firewall Settings

•Internal Port—Port number used by the router when forwarding Internet traffic to the personal computer or server on your LAN and is usually the same as the External Port number. If it is different, the router performs a Port Translation, so that the port number used by Internet users is different from the port number used by the server or Internet application.

For example, you could configure your Web Server to accept connections on both port 80 (standard) and port 8080. Then, enable Port Forwarding, set the External Port to 80 and the Internal Port to 8080.

Now, any traffic from the Internet to your Web server uses port 8080, even though the Internet users used the standard port, 80. (Users on the local LAN can and should connect to your Web Server using the standard port 80.)

•Protocol—Select the protocol used for this application, TCP or UDP.

•IP Address—For each application, enter the IP address of the personal computer running the specific server application.

•Enabled—Select Enabled to enable port forwarding for the relevant server application.

STEP 3 Click Save.

Configuring Port Range Forwarding

The Firewall > Port Range Forwarding window displays the settings associated with public services accessed on your network that use single or multiple port numbers, such as web servers, FTP servers, e-mail servers, or other specialized Internet applications that use one or multiple port numbers (for example, video conferencing). Port Range Forwarding is one of the NAPT (Network Address Port Translation) features.

The Port Range Forwarding window allows you to configure access to these public services on your network. The port numbers being used does not change while forwarding to the local network. This allows users on the Internet to access this server by using the WAN port IP address and the pre-defined port numbers.

When users send these types of requests to your WAN port IP address via the Internet, the NAT router forwards those requests to the appropriate servers on your LAN.

Cisco WRVS4400N Wireless-N Gigabit Security Router with VPN Administration Guide 100