Netgear AC1450 User Manual - Page 64

Block Services (Port Filtering), To block services, Advanced > Security > Block Services

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AC1450 Smart WiFi Router Block Services (Port Filtering) Services are functions that server computers perform 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 Task 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 to 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. 2. Select either Per Schedule or Always. 3. If you selected Per Schedule, specify a time period in the Schedule screen. 4. Click Add to add a service. Security 64

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Security
64
AC1450 Smart WiFi Router
Block Services (Port Filtering)
Services are functions that server computers perform 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
Task Force (IETF at
) 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 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
.
2.
Select either
Per Schedule
or
Always
.
3.
If you selected Per Schedule, specify a time period in the Schedule screen.
4.
Click
Add
to add a service.