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Wireless Cable Modem Gateway CG814WG v3 Reference Manual
3-6 Content Filtering and Firewall Rules
v1.0, June 2007
The Firewall Rules screen is shown below:
Port Forwarding
With port forwarding, you can make local computers or servers available to the Internet for
different services. For example, FTP uses TCP ports 20 and 21. The selections on this screen are:
• Active Forwarding Rules: This table displays a list of ports that are currently forwarded.
• Choose Predefined Service: Select a predefined service from the pull-down menu.
• Add Custom Rules: You can set up a custom service that is not in the list of predefined
services.
• To access the local computer from the Internet, you must use the WAN address of your
gateway, which can be found on the Basic Settings page.
Because the gateway uses Network Address Translation (NAT), your network presents only one IP
address to the Internet, and outside users cannot directly address any of your local computers.
However, by defining an inbound rule you can make a local server (for example, a web server or
Figure 3-5