Netgear WNDR4500 User Manual download pdf (Page 72)

Security

N900 Wireless Dual Band Gigabit Router WNDR4500v2

Block Services (Port Filtering)

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 the destination port number 80 is an HTTP

(web server) request.

The service numbers for many common protocols are defined by the Internet Engineering

ask Force (IETF at http://www.ietf.org/) and published in RFC1700, “Assigned Numbers.”

Service numbers for other applications are typically chosen from the range 1024 - 65535 by

the authors of the application. Although the router already holds a list of many service port

numbers, you are not limited to these choices. You can often determine port number

information by contacting the publisher of the application, by asking user groups or

newsgroups, or by searching.

The Block Services screen lets you add and block specific Internet services by computers on

your network.

This is called service blocking or port filtering. To add a service for blocking,

first determine which port number or range of numbers the application uses.

 To block services:

1. Select

Advanced > Security > Block Services to display the following screen:

2. Select either Per Schedule or Always to enable service blocking, and click Apply. If you

selected Per Schedule, specify a time period in the Schedule screen as described in

Schedule Blocking on page 74.

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Netgear WNDR4500 User Manual Page 72