Netgear DGN3500 User Manual download pdf (Page 51)

RangeMax Wireless-N DSL Gigabit Modem Router DGN3500 User Manual

Protecting Your Network 3-13

v1.0, November 2009

The Firewall Rules screen also lets you easily open or close AOL or MSN Instant Messenger

ports:

1. Under Instant Messaging (IM) Ports, select a radio button:

• Close IM Ports. Specifies to disable instant messaging traffic.

• Open IM Ports. Specifies to enable instant messaging traffic. IM ports are open by

default.

2. Click Apply to save your changes.

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 modem router already holds a list of many service port numbers, you are not limited

to these choices. Use the following procedure to create your own service definitions.

To add or change a service:

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, and default password of password, or using whatever password and

LAN address you have chosen for the modem router.

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Netgear DGN3500 User Manual Page 51