ZyXEL Communications NBG-416N User Manual

 Chapter 10 Network Address Translation

NBG-416N User’s Guide

The following section contains additional technical information about the NBG-
416N features described in this chapter.

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

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.

Apply

Click Apply to save your changes to the Application Rules Summary 
table.

Reset

Click Reset to not save and return your new changes in the Service 
Name and Port fields to the previous one.

Application Rules Summary
#

This is the number of an individual port forwarding server entry.

Active

This icon is turned on when the rule is enabled. 

Name

This field displays a name to identify this rule.

Local Start/End 
Port

Public Start/End 
Port

This field displays the port number(s). 

Protocol

This is the transport layer protocol used for the service.

Server IP 
Address

This field displays the inside IP address of the server.

Modify

Click the Edit icon to display and modify an existing rule setting in the 
fields under Add Application Rule. 

Click the Remove icon to delete a rule.

Table 48   Network > NAT > Application (continued)