ZyXEL Communications 2 Plus User Manual

Chapter 11 Firewall

ZyWALL 2 Plus User’s Guide

Click SECURITY > FIREWALL > Service > Add to display the following screen. Use this 
screen to configure a custom service entry not is not predefined in the ZyWALL. See 

 the user’s guide appendices for a list of commonly used services and 

port numbers.   
See 

 for more information about the firewall.

Figure 143   Firewall Edit Custom Service

The following table describes the labels in this screen.

Protocol

This is the IP protocol type.
If you selected Custom, this is the IP protocol value you entered.

Attribute

This is the IP port number or ICMP type and code that defines the service.

Modify

Click the edit icon to go to the screen where you can edit the service.
Click the delete icon to remove an existing service. A window displays asking you 

to confirm that you want to delete the service. Note that subsequent services 

move up by one when you take this action.

Add

Click this button to bring up the screen that you use to configure a new custom 

service that is not in the predefined list of services.

Predefined 

Service

This table shows all the services that are already configured for use in firewall 

rules. See 

 for a list of common services.

#

This is the index number of the predefined service.

Service Name

This is the name of the service.

Protocol

This is the IP protocol type. There may be more than one IP protocol type.

Attribute

This is the IP port number or ICMP type and code that defines the service. 

Table 54   SECURITY > FIREWALL > Service (continued)

Table 55   SECURITY > FIREWALL > Service > Add

Service Name

Enter a descriptive name of up to 31 printable ASCII characters (except 

Extended ASCII characters) for the custom service. You cannot use the “(“ 

character. Spaces are allowed. 

IP Protocol

Choose the IP protocol (TCP, UDP, TCP/UDP, ICMP or Custom) that defines 

your customized service from the drop down list box.
If you select Custom, specify the protocol’s number. For example, ICMP is 1, 

TCP is 6, UDP is 17 and so on.