This article will show you how to use the Linksys router's Port Range Forwarding feature. This includes configuring the router to forward specific incoming traffic from the Internet to the appropriate host(s) in order to share internal applications and files with Internet users. This article is designed for CCNA students, network engineers, and anyone looking to share internal applications and files on the Internet using the Linksys wireless router.
This article falls under the CCNA syllabus's objective "Explain and select the appropriate administrative tasks required for a WLAN". The Linksys router allows you to share your internal applications and files with Internet users. Thus, you make your network resources public. This means that Internet users can access an internal application (web service, FTP service, Email service, computer game...) hosted on one or many of your network computers. Each of the previous services is accessible through a specific port.
Therefore, you should configure the router to redirect incoming traffic toward specific port(s) to the appropriate network computer(s). As a result, users on the Internet can access your internal application successfully. To do this, the Linksys router offers feature called "Port Range Forwarding". It allows you to map a single port or a range of port to single machine. Additionally, you can also map one or a range of ports to multiple machines. Read the following instructions in order to configure the Port Range Forwarding feature:
Step 1: Open your favorite web browser application, and enter the IP address 192.168.1.1 in the address field. Then press Enter.
Step 2: In the authentication dialog box, enter the administrator's username and password. The default values are admin/admin for the username/password. However, on some Linksys router platforms, the default value for the username is the blank and for the password is admin.
Step 3: Click Applications & Gaming.
Step 4: Click Port Range Forwarding.
Step 5: In the Application field, enter a name for your application.
Step 6: In the Start field, enter the range's start port.
Step 7: In the End field, enter the range's end port.
Step 9: In the Protocol field, select either UDP or TCP, or both.
Step 10: In the IP Address field, enter the IP address of the internal computer.
Step 11: Select Enable in order to enable port forwarding for your application.
Step 12: Click Save Settings.
Note that Internet users will use your router's public IP address in order to access your internal applications. Therefore, you should buy a static public IP address because the router's public IP address changes. However, you can avoid this by configuring the Dynamic DNS feature.
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