User's Manual

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NAT (Network Address Translation)
NAT is the translation between public IP address and private IP address. While
NAT is enabling, you can use port forwarding or DMZ to redirect your common
network services. If you want to disable NAT, you can go to Management-Route
page to disable it and the functions of DMZ, Port Forwarding will be disabled.
Configuring Port Forwarding (Virtual Server)
This function allows you to automatically redirect common network services
to a specific machine behind the NAT firewall. These settings are only
necessary if you wish to host some sort of server like a web server or mail
server on the private local network behind the device's NAT firewall.
The most often used port numbers are shown in the following table.
Services Port Number
ECHO 7
FTP (File Transfer Protocol) 21
Telnet 23
SMTP (Simple Mail Transfer Protocol) 25
DNS (Domain Name System) 53
Finger 79
HTTP (Hyper Text Transfer Protocol) 80
POP3 (Post Protocol) 110
NNTP (Network News Transport Protocol) 119
SNMP (Simple Network Management Protocol) 161
SNMP trap 162
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