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Reference Manual for the Model FR114P, FR114W and FM114P Cable/DSL ProSafe Firewall
5-14 Security
Services
Services are functions performed by server computers at the request of client computers. 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 RFC1700, “Assigned Numbers.” Service numbers for other
applications are typically chosen from the range 1024 to 65535 by the authors of the application.
Although the NETGEAR ProSafe Firewall already holds a list of many service port numbers, you
are not limited to these choices. Use the Services menu to add additional services and applications
to the list for use in defining firewall rules. The Services menu shows a list of services that you
have defined, as shown in Figure 5-8:
Figure 5-8. Services menu
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