NETGEAR UTM5 User Manual

Firewall Protection
154
ProSecure Unified Threat Management (UTM) Appliance
Add Customized Services
Services are functions performed by server computers at the request of client computers. You
can configure up to 125 custom services.
For example, web servers serve web pages, time servers serve time and date information,
and game hosts serve data about other players’ moves. When a computer on the Internet
sends a request for service to a server computer, the requested service is identified by a
service or port number. This number appears as the destination port number in the
transmitted IP packets. For example, a packet that is sent with destination port number 80 is
an HTTP (web server) request.
The service numbers for many common protocols are defined by the Internet Engineering
Task Force (IETF) and published in RFC 1700, Assigned Numbers. Service numbers for
other applications are typically chosen from the range 1024 to 65535 by the authors of the
application.
Although the UTM already holds a list of many service port numbers, you are not limited to
these choices. Use the Services screen to add additional services and applications to the list
for use in defining firewall rules. The Services screen shows a list of services that you have
defined, as shown in Figure 85 on page 155.
To define a new service, you need to determine first which port number or range of numbers
is used by the application. You can usually determine this information by contacting the
publisher of the application, user groups, or newsgroups. When you have the port number
information, you can enter it on the Services screen.
You use a customized service as a firewall object to which you apply a firewall rule, that is,
you select the customized service from the Service drop-down list on a screen on which you
add or edit a firewall rule.
 To add a customized service:
1. Select Network Security > Services. The Services screen displays. The Custom
Services table shows the user-defined services. (The following figure shows some
examples.)

NETGEAR UTM5 Specifications

General

Brand	NETGEAR
Model	UTM5
Category	Firewall
Language	English