Port Filtering To Block Services - NETGEAR AC1200 JR6100 User Manual

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Port Filtering to Block Services

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, a service or port number identifies the requested service. 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 Internet Engineering Task Force (IETF at http://www.ietf.org/) has defined the service
number for many common protocols, which are published in RFC1700, Assigned Numbers.
Application developers typically choose service numbers for other applications in 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.
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 find out which port number or range of numbers the application uses.
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To block services:
1. Select ADVANCED > Security > Block Services.
2. Select either the Per Schedule button or the Always button.
3. If you selected Per Schedule, specify a time period in the Schedule screen.
4. Click the Add button.
AC1200 WiFi Router JR6100
Security
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