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Reference Manual for the ADSL Modem Router DG834 v3
3-12 Protecting Your Network
v1.1, October 2006
For any traffic attempting to pass through the firewall, the packet information is subjected to the
rules in the order shown in the Rules Table, beginning at the top and proceeding to the default rules
at the bottom. In some cases, the order of precedence of two or more rules may be important in
determining the disposition of a packet. The Move button allows you to relocate a defined rule to a
new position in the table.
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 DG834 v3 already holds a list of many service port numbers, you are not limited to
these choices. Use the procedure below to create your own service definitions.
How to Define Services
1. Log in to the modem router at its default LAN address of http://192.168.0.1 with its default
User Name of admin, default password of password, or using whatever Password and LAN
address you have chosen for the modem router.
2. Select the Services link of the Security menu to display the Services menu shown in
Figure 3-9:
• To create a new Service, click the Add Custom Service button.
Figure 3-9