Security
69
R6200v2 Smart WiFi Router
2.
Click the
Apply
button.
Your changes are saved.
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, a 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/
) defines service numbers
for many common protocols and they are 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
.
2.
Select either the
Per Schedule
or
Always
button.
3.
If you selected Per Schedule, specify a time period in the Schedule screen.
4.
Click the
Add
button to add a service.
