Add Customized Services - NETGEAR SRX5308 Reference Manual

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 VPN firewall 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 (see the following figure)
shows a list of services that you have defined.
To define a new service, first you need to determine 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 or user groups or newsgroups. When you have the port number
information, you can enter it on the Services screen.
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To add a customized service:
1. Select Security > Services. The Services submenu tabs display, with the Services
screen in view. The screen displays the Custom Services Table with the user-defined
services. (The following figure shows some examples.)
Figure 59.
ProSafe Gigabit Quad WAN SSL VPN Firewall SRX5308
Firewall Protection
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