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Firewall
You may set up firewall rules to protect your network from viruses and other
malicious activity on the Internet.
Port Mapping
You can set up Port Mapping to enable external computers to access www,
FTP, or other services provided by LAN. Select Settings > Firewall > Port
Mapping. The Port Mapping page is shown in the following figure:
Select Enable > Apply and the Port Mapping Settings will appear.
Source Port: Set the source port of the computer that provides services.