Netgear SRXN3205 SRXN3205 Reference Manual - Page 89

Adding Customized Services, Services, Security > Services

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ProSafe Wireless-N VPN Firewall SRXN3205 Reference Manual Adding Customized 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 SRXN3205 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 menu shows a list of services that you have defined, as shown in Figure 5-8. 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 or newsgroups. When you have the port number information, you can enter it on the Services screen. To add a custom service: 1. Select Security > Services from the main/submenu and the Services screen displays. Figure 5-8 2. In the Add Custom Services section, enter a descriptive name for the service (this name is for your convenience). 3. Select the Layer 3 transport protocol of the service: TCP, UDP, or ICMP. 4. Enter the first TCP or UDP port of the range that the service uses. 5. Enter the last port of the range that the service uses. If the service only uses a single port number, enter the same number in both fields. Firewall Security and Content Filtering v1.0, October 2008 5-15

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ProSafe Wireless-N VPN Firewall SRXN3205 Reference Manual
Firewall Security and Content Filtering
5-15
v1.0, October 2008
Adding Customized 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 SRXN3205 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 menu shows a list of services that you have defined, as
shown in
Figure 5-8
.
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 or newsgroups. When you have the port number information, you
can enter it on the
Services
screen.
To add a custom service:
1.
Select
Security > Services
from the main/submenu and the Services screen displays.
2.
In the
Add Custom Services
section, enter a descriptive name for the service (this name is for
your convenience).
3.
Select the Layer 3 transport protocol of the service: TCP, UDP, or ICMP.
4.
Enter the first TCP or UDP port of the range that the service uses.
5.
Enter the last port of the range that the service uses. If the service only uses a single port
number, enter the same number in both fields.
Figure 5-8