The Service Summary Screen - ZyXEL Communications ZyWall ATP series User Manual

Chapter 34 Object
Both TCP and UDP use ports to identify the source and destination. Each port is a 16-bit number. Some
port numbers have been standardized and are used by low-level system processes; many others have
no particular meaning.
Unlike TCP and UDP, Internet Control Message Protocol (ICMP, IP protocol 1) is mainly used to send error
messages or to investigate problems. For example, ICMP is used to send the response if a computer
cannot be reached. Another use is ping. ICMP does not guarantee delivery, but networks often treat
ICMP messages differently, sometimes looking at the message itself to decide where to send it.
Service Objects and Service Groups
Use service objects to define IP protocols.
• TCP applications
• UDP applications
• ICMP messages
• user-defined services (for other types of IP protocols)
These objects are used in policy routes, security policies, and IDP profiles.
Use service groups when you want to create the same rule for several services, instead of creating
separate rules for each service. Service groups may consist of services and other service groups. The
sequence of members in the service group is not important.

34.7.2 The Service Summary Screen

The Service summary screen provides a summary of all services and their definitions. In addition, this
screen allows you to add, edit, and remove services.
To access this screen, log in to the Web Configurator, and click Configuration > Object > Service >
Service. Click a column's heading cell to sort the table entries by that column's criteria. Click the
heading cell again to reverse the sort order.
Figure 409 Configuration > Object > Service > Service
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