Owner's Manual

Security
64
R6250 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, a service or port number identifiefs the requested
service. This number is 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 and published
the service numbers for many common protocols 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 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.