NAT Server
The NAT Server feature maps a public address and port number to the private IP address and port number of an internal server. This feature allows servers in the private network to provide services for external users.
Figure 51: NAT Server operation
Figure 51 displays how NAT Server works:
Upon receiving a request from the host, NAT translates the public destination IP address and port number to the private IP address and port number of the internal server.
Upon receiving a response from the server, NAT translates the private source IP address and port number to the public IP address and port number.