Netgear jr6150-100rus — как настроить фильтрацию портов на беспроводном маршрутизаторе [87/159]

Security

A750 Wireless Dual Band Gigabit Router JR6150

Port FIltering to Block 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 players’ moves. When a computer on the Internet sends a

request for service to a server computer, the requested service gets 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.”

The authors of other applications typically choose service numbers for those applications

from the range 1024–65535. Although the router already holds a list of many service port

numbers, you are not limited to these choices. You can often find port number information by

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

searching.

You can add and block specific Internet services by computers on

your network.

This process

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. Log in to the router.

For more information, see Use NETGEAR genie after Installation

on page 17.

2. Select ADVANCED > Security > Block Services.

3. Select either the Per Schedule radio button or the Always radio button.

4. If you selected Per Schedule

, specify a time period in the Schedule screen.

For more information, see Schedule Blocking on page 88.