Port Range Forwarding Configuration on WRVS4400N Routers

Objective

Port Forwarding is a process of intercepting traffic destined for a range of IP/Ports combination and redirecting it to different IP/Ports. Port range forwarding is done so the data for Internet applications can pass through the firewall of the router or gateway.  An example of an application port is port 25 which is assigned for email or Simple Mail Transfer Protocol (SMTP).

This document explains the configuration of Port Range Forwarding on WRVS4400N Wireless VPN router.

Note: Ensure that you have the port numbers for the Internet application you are forwarding ports for. This may be obtained from the application’s documentation or their website.

Applicable Devices

• WRVS4400N Wireless-N Gigabit Security Router

Software Version

• v2.0.1.3

Port Range Forwarding Configuration

Step 1. Log in the web configuration utility and choose Firewall > Port Range Forwarding. The Port Range Forwarding page opens:

Step 2. In the Application field, enter the name of the application.

Step 3. In the Start field, enter the starting port range of the server or the Internet application.

Step 4. In the End field, enter the ending port range of the server or the Internet application.

Step 5. From the Protocol drop-down menu, choose the protocol used by the application.

• TCP — Transmission Control Protocol (TCP) enables two hosts to establish a connection and exchange streams of data. TCP guarantees delivery of data and also guarantees that packets will be delivered in the same order in which they were sent. With the use of the TCP protocol, applications can communicate securely at the transport layer because of the TCP protocols acknowledgement system, independently from the lower layers.

• UDP — User Datagram Protocol (UDP) is a communications protocol that offers a limited amount of service when messages are exchanged between computers in a network that uses the Internet Protocol (IP). Unlike TCP, however, UDP does not provide the service of dividing a message into packets (datagrams) and reassemble it at the other end in the same sequence. Network applications that want to save processing time because they have very small data units to exchange may prefer UDP.

• Both — This option will use both of the TCP and UDP protocols.

Step 6. In the IP Address field, enter the desired IP address of the host on the LAN side to which the specific IP traffic will be forwarded.

Step 7. Check the Enable check box to enable Port Range Forwarding for your required application.

Step 8. Click Save to save the settings.