ZyXEL Communications P-661HW Series User Manual

P-661H/HW Series User’s Guide

Chapter 7 Network Address Translation (NAT) Screens

137

Figure 72   NAT General

The following table describes the labels in this screen. 

A port forwarding set is a list of inside (behind NAT on the LAN) servers, for example, web or 
FTP, that you can make visible to the outside world even though NAT makes your whole 
inside network appear as a single computer to the outside world. 

You may enter a single port number or a range of port numbers to be forwarded, and the local 
IP address of the desired server. The port number identifies a service; for example, web 
service is on port 80 and FTP on port 21. In some cases, such as for unknown services or 
where one server can support more than one service (for example both FTP and web service), 
it might be better to specify a range of port numbers. You can allocate a server IP address that 
corresponds to a port or a range of ports.

Many residential broadband ISP accounts do not allow you to run any server processes (such 
as a Web or FTP server) from your location. Your ISP may periodically check for servers and 
may suspend your account if it discovers any active services at your location. If you are 
unsure, refer to your ISP.

Table 50   NAT General

Active 

Network 

Address 

Translation 

(NAT)

Select this check box to enable NAT.

SUA Only

Select this radio button if you have just one public WAN IP address for your ZyXEL 

Device. 

Full Feature 

Select this radio button if you have multiple public WAN IP addresses for your ZyXEL 

Device. 

Apply

Click Apply to save your changes back to the ZyXEL Device.

Cancel

Click Cancel to reload the previous configuration for this screen.