ZyXEL NBG-419N Guia Do Utilizador

 Chapter 15 Network Address Translation (NAT)

NBG-419N User’s Guide

Use the Application screen to forward incoming service requests to the server(s) 
on your local network. 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.

In addition to the servers for specified services, NAT supports a default server. A 
service request that does not have a server explicitly designated for it is 
forwarded to the default server. If the default is not defined, the service request is 
simply discarded.

Note: 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.

Port forwarding allows you to define the local servers to which the incoming 
services will be forwarded. To change your NBG-419N’s port forwarding settings, 
click Network > NAT > Application. The screen appears as shown.

Note: If you do not assign a Default Server IP address in the NAT > General screen, 

the NBG-419N discards all packets received for ports that are not specified in 
this screen or remote management.

Apply

Click Apply to save your changes back to the NBG-419N.

Reset

Click Reset to begin configuring this screen afresh.

Table 57   Network > NAT > General