ZyXEL Communications P-660H-TX - Manual (Page 48)

P-660H-Tx v2 Support Notes
Please note that a server can support more than one service, e.g., a server
can provide both FTP and Mail service, while another provides only Web
service.
The following procedures show how to configure a server behind NAT.
Step 1: Login Web Configurator, Advanced Setup, Network -> NAT -> Port
Forwarding.
Step 2: Select the service name from the pull-down menu, and fill in the server
Address on ‘Server IP Address’, then click button ‘Add’ to save it.
Step 3: You could click the button ‘Edit’ on the rule to modify the Service name,
Server IP Address, Start/End Port.
The most often used port numbers are shown in the following table. Please
refer RFC 1700 for further information about port numbers.
Service Port Number
FTP 21
Telnet 23
SMTP 25
DNS (Domain Name Server) 53
www-http (Web) 80
PPTP (Point-to-Point Tunneling
Protocol) 1723
• Examples
• Internet Access Only
• Internet Access with an Internal Server
• Using Multiple Global IP addresses for clients and servers
• Support Non NAT Friendly Applications
(1) Internet Access Only
In our Internet Access example, we only need one rule where all our ILAs map
to one IGA assigned by the ISP. You can just use the default SUA NAT, or you
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