User's Manual Part 2

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Chapter 6 Special Applications
6.1 Port Range Forwarding
Port range forwarding is useful for web servers, ftp servers, e-mail
servers, gaming and other specialized Internet applications. When
you enable port forwarding, the communication requests from the
Internet to your router’s WAN port will be forwarded to the specified
LAN IP address. As seen in the figure above, to let PC3 access service
ports on PC1, you must first configure port forwarding settings on
the router to which PC1 is uplinked.