Netgear DG834GV v2 User Manual download pdf (Page 54)

Reference Manual for the Integrated ADSL Modem and Wireless Router with Voice, Model

5-12 Protecting Your Network

v1.0, September 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 DG834GV 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:

Figure 5-9

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Netgear DG834GV v2 User Manual Page 54