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66
7
7.
Security
Keeping unwanted content out of your network
This chapter explains how to use the basic firewall features of the router to prevent objectionable
content from reaching the computers and other devices connected to your network.
This chapter includes the following sections:
•
Keyword Blocking of HTTP Traffic
•
Block Services (Port Filtering)
•
Schedule Blocking
•
Security Event Email Notifications
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Security
67
N900 Wireless Dual Band Gigabit Router R4500
Keyword Blocking of HTTP Traffic
Use keyword blocking to prevent certain types of HTTP traffic from accessing your network.
The blocking can be always or according to a schedule.
To block sites:
1.
Select
Advanced > Security >
Block Sites
:
2.
Select one of the keyword blocking options:
•
Per Schedule
. Turn on keyword blocking according to the Schedule screen settings.
•
Always
. Turn on keyword blocking all the time, independent of the Schedule screen.
3.
In the keyword field, enter a keyword or domain, click
Add Keyword,
and click
Apply
.
The keyword list supports up to 32 entries. Here are some sample entries:
•
•
Specify .com if you want to allow only sites with domain suffixes such as .edu or .gov.
•
Enter a period (
.
) to block all Internet browsing access.
To delete a keyword or domain:
1.
Select the keyword you want to delete from the list.
2.
Click
Delete Keyword
.
3.
Click
Apply
to save your settings.
To specify a trusted computer:
You can exempt one trusted computer from blocking and logging. The computer you exempt
has to have a fixed IP address.
1.
In the Trusted IP Address field, enter the IP address.
2.
Click
Apply
to save your settings.
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Security
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N900 Wireless Dual Band Gigabit Router R4500
Block Services (Port Filtering)
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 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 - 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
to enable service blocking.
3.
Click
Apply
.
If you selected Per Schedule, specify a time period in the Schedule screen. For
information, see
Schedule Blocking
on page 70.
4.
Click
Add
to add a service.
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N900 Wireless Dual Band Gigabit Router R4500
The Block Services Setup screen displays:
5.
From the Service Type list, select the application or service to allow or block.
The list already displays several common services, but you are not limited to these
choices. To add any additional services or applications that do not already appear, select
User Defined
.
6.
If you know that the application uses either TCP or UDP, select the appropriate protocol. If
you are not sure, select
Both
.
7.
Enter the starting and ending port numbers. If the application uses a single port number,
enter that number in both fields.
8.
Select the radio button for the IP address configuration you want to block, and enter the IP
addresses. You can block the specified service for a single computer, a range of computers
with consecutive IP addresses, or all computers on your network.
9.
Click
Add
to enable your Block Services Setup selections.
Page 70 / 126
Security
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N900 Wireless Dual Band Gigabit Router R4500
Schedule Blocking
You can specify the days and time that you want to block Internet access.
To schedule blocking:
1.
Select
Advanced > Security > Schedule
:
2.
Set up the schedule for blocking keywords and services.
•
Days to Block
. Select days on which you want to apply blocking by selecting the
appropriate check boxes, or select
Every Day
to select the check boxes for all days.
•
Time of Day to Block
. Select a start and end time in 24-hour format, or select
All
Day
for 24-hour blocking.
3.
Select your time zone from the list. If you use daylight savings time, select the
Automatically adjust for daylight savings time
check box.
4.
Click
Apply
to save your settings.

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