Sapido RB-1232, User Manual

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5.3 NAT
NAT is a method of mapping one or more IP addresses and/or services ports into different
specified services, where NAT stands for Network Address Translation. It allows the internal
IP addresses of many computers on a Local Area Network (LAN) to be translated to one
public address, saving users’ cost. It also plays a security role by obscuring the true IP
addresses of important machines from potential hackers on the Internet. For convenience, we
called a router having the NAT facility as a NAT-enabled router.
5.3.1 Visual Server
To offer services, like WWW, FTP, provided by a server in your local network accessible for
outside users, you should specify a local IP address to the server. Then, add the IP address
and network protocol type, port number, and name of the service in the following list. Based
on the list, the gateway will forward service request from outside users to the corresponding
local server.
1. Enable Port Forwarding
Enable Port Forwarding to allow an external user to reach a port within a private LAN.
2. IP Address
Specify the private IP address of the internal host offering the service.