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3
3.
Content Filtering
The router provides various options for blocking Internet-based content and communications
services. With its content filtering feature, the router prevents objectionable content from
reaching your computers. You can control access to Internet content by screening for keywords
within web addresses. Content filtering options include:
•
Keyword blocking of HTTP traffic.
•
Outbound service blocking. Limits access from your LAN to Internet locations or services
that you specify as off-limits.
•
Denial of service (DoS) protection. Detects and thwarts DoS attacks such as Ping of
Death, SYN flood, LAND attack, and IP spoofing.
•
Blocking unwanted traffic from the Internet to your LAN.
The router allows you to restrict access to Internet content based on web addresses and web
address keywords. The following sections describe how to use the basic firewall features of the
router to protect your network.
•
Block Sites
•
Block Services
•
Schedule
•
Email
Note:
For information about the advanced content filtering features port
forwarding and port triggering, see
Port Forwarding/Port Triggering
on page 66.
Note:
To access online help, click the online help button (
).
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Block Sites
To block sites:
1.
Log in to the router as described in
Log In to Your Router
on page 17.
2.
From the main menu, select
Content Filtering > Block Sites
.
The following screen displays:
3.
To enable keyword blocking, select one of the following:
•
Per Schedule
. Turn on keyword blocking according to the settings on the Schedule
screen. See
Schedule
on page 44.
•
Always
. Turn on keyword blocking all the time, independent of the setting in the
Schedule screen.
4.
Enter the keyword or domain you want to block in the keyword field, click
Add Keyword
and
click
Apply
.
Some examples of keyword applications are shown in the following table.
Keyword
Result
XXX
.com
Only websites with other domain suffixes (such as .edu or .gov) can be viewed.
. (a period)
Block all Internet browsing access.
Up to 32 entries are supported in the keyword list.
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5.
To delete a keyword or domain, select it from the list, click
Delete Keyword
and click
Apply
.
6.
To specify a trusted user, enter that computer’s IP address in the Trusted IP Address field
and click
Apply
.
You can specify one trusted user, which is a computer that is exempt from blocking and
logging. Since the trusted user is identified by an IP address, you should configure that
computer with a fixed IP address.
7.
Click
Apply
to save your settings.
Block Services
To block services:
1.
Log in to the router as described in
Log In to Your Router
on page 17.
2.
From the main menu, select
Content Filtering > Block Services
.
3.
Select one of the following:
•
Per Schedule
. Turn on service blocking according to the settings in the Schedule
screen. See
Schedule
on page 44.
•
Always
. Turn on service blocking all the time, independent of the Schedule screen.
4.
Click
Add
, and the following screen displays:
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5.
Either select a service from the Service Type drop-down list, or select
User Defined
and use
the Service/Type User Defined field to create a custom service.
6.
Click
Add
to create the service, and it is listed in the Service Table on the Block Services
screen.
7.
Click
Apply
to save your settings.
Schedule
The router uses Network Time Protocol (NTP) to obtain the current time and date from one of
several network time servers on the Internet.
Schedule Content Filtering
If you enabled keyword or service blocking in the Block Sites or Block Services screens, you
can set up a schedule for when blocking occurs or when access is not restricted.
To schedule content filtering:
1.
Log in to the router as described in
Log In to Your Router
on page 17.
2.
From the main menu, select
Content Filtering > Schedule
.
The following screen displays:
3.
To block Internet keywords and services based on a schedule, select
Every Day
, or select
one or more days. If you want to limit access completely for the selected days, select
All
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Day
. Otherwise, to limit access during certain times for the selected days, fill in the Start
Blocking and End Blocking fields.
4.
Enter the values in 24-hour time format. For example, 10:30 a.m. would be 10 hours and 30
minutes, and 10:30 p.m. would be 22 hours and 30 minutes. If you set the start time after the
end time, the schedule will be effective through midnight the next day.
5.
Click
Apply
to save your changes.
Localize Your Time Zone
To localize the time for your log entries, you must specify your time zone.
To specify your time zone:
1.
Log in to the router as described in
Log In to Your Router
on page 17.
2.
From the main menu, select
Content Filtering > Schedule
.
The following screen displays:
3.
Select your time zone. This setting is used for the blocking schedule according to your local
time zone and for time-stamping log entries.
If your time zone uses daylight saving time, select the
Automatically adjust for daylight
savings time
check box.
4.
Click
Apply
to save your settings.
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