ZyXEL Communications NBG-418N v2 User Manual

Chapter 10 Network Address Translation

NBG-418N v2 User’s Guide

 Network > NAT > Application 

The following table describes the labels in this screen.

Network > NAT > Application

Add Application Rule

User Name

Select an option from the drop-down list to choose a pre-defined service. The pre-
defined service port number(s) and protocol will display in the fields below.

User-Defined 
User Name

Type a name (of up to 31 printable characters) to identify this rule in the first field. 
Otherwise, select a predefined service in the User Name drop-down list. The predefined 
service name and port number(s) will display in the User Name, Public and Local Port 
fields.

Protocol

Select the transport layer protocol used for the service. Choices are TCP, UDP, or 
TCP&UDP. 

Public Port Range

Local Port Range

Type a port number(s) to be forwarded.

To specify a range of ports, enter a hyphen (-) between the first port and the last port, 
such as 10-20.

To specify two or more non-consecutive port numbers, separate them by a comma 
without spaces, such as 123,567.

Server IP Address Type the inside IP address of the server that receives packets from the port(s) specified in 

the Port field.

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

User Name

This field displays a name to identify this rule.

Protocol

This field displays the transport layer protocol supported by this server.

Server IP Address This field displays the inside IP address of the server.

Local Port Range

Public Port Range

This field displays the port number(s). 

State

This is the transport layer protocol used for the service.

Action

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

Click the Delete icon to delete a rule.