Adding Customized Services - NETGEAR ProSafe FVS338 Reference Manual

FVS338 ProSafe VPN Firewall 50 Reference Manual
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Figure 4-11

Adding 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 RFC1700, "Assigned Internet Protocol Numbers." Service numbers
for other applications are typically chosen from the range 1024 to 65535 by the authors of the
application.
Although the FVS338 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 4-12.
To define a new service, first you must determine which port number or range of numbers is used
by the application. This information can usually be determined by contacting the publisher of the
application or from user groups of newsgroups. When you have the port number information, you
can enter it on the Services screen.
Firewall Protection and Content Filtering 4-17
v1.0, September 2006