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Content Filtering
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Chapter 4
Content Filtering
This chapter describes how to use the content filtering features of the TA612V Broadband Voice
Adapter to protect your network. These features can be found by clicking on the Content Filtering
heading in the Main Menu of the browser interface.
The TA612V Broadband Voice Adapter provides you with web content filtering options, plus
browsing activity reporting and instant alerts via e-mail. Parents and network administrators can
establish restricted access policies based web addresses and web address keywords. You can also
block Internet access by applications and services, such as chat or games.
Blocking Access to Internet Sites
The TA612V adapter allows you to restrict access based on web addresses and web address
keywords. Up to 255 entries are supported in the Keyword list. The Block Sites menu is below:
Figure 4-1:
Block Sites menu
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To enable keyword blocking, select either “Per Schedule” or “Always”, then click Apply. If you
want to block by schedule, be sure that a time period is specified in the Schedule menu.
To add a keyword or domain, type it in the Keyword box, click Add Keyword, then click Apply.
To delete a keyword or domain, select it from the list, click Delete Keyword, then click Apply.
Keyword application examples:
•
If the keyword "XXX" is specified, the URL <http://www.badstuff.com/xxx.html> is blocked.
•
If the keyword “.com” is specified, only websites with other domain suffixes (such as .edu or
.gov) can be viewed.
•
If you wish to block all Internet browsing access during a scheduled period, enter the keyword
“.” and set the schedule in the Schedule menu.
To specify a Trusted User, enter that computer’s IP address in the Trusted User box and click
Apply. You may specify one Trusted User, which is a computer that will be exempt from blocking
and logging. Since the Trusted User will be identified by an IP address, you should configure that
computer with a fixed IP address.
Blocking Access to Internet Services
The TA612V adapter allows you to block the use of certain Internet services by computers on your
network. This is called services blocking or port filtering. The Block Services menu is shown
below:
Figure 4-2:
Block Services menu
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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 your network sends a request for
service to a server computer on the Internet, 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 destination port number 80 is an HTTP (web server) request.
To specify a service for blocking, click Add. The Add Services menu will appear, as shown below:
Figure 4-3:
Add Services menu
From the Service Type list, select the application or service to be allowed or blocked. 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.
•
Configuring a User Defined Service
To define a service, first you must determine which port number or range of numbers is used by
the application. The service numbers for many common protocols are defined by the Internet
Engineering Task Force (IETF) and published in RFC1700, “Assigned Numbers.” Service
numbers for other applications are typically chosen from the range 1024 to 65535 by the authors of
the application. This information can usually be determined by contacting the publisher of the
application or from user groups of newsgroups.
Enter the Starting Port and Ending Port numbers. If the application uses a single port number, enter
that number in both boxes.
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If you know that the application uses either TCP or UDP, select the appropriate protocol. If you are
not sure, select Both.
•
Configuring Services Blocking by IP Address Range
Under “Filter Services For”, you can block the specified service for a single computer, a range of
computers (having consecutive IP addresses), or all computers on your network.
Configuring E-Mail Alert and Web Access Log Notifications
In order to receive logs and alerts by email, you must provide your email information in the E-Mail
menu, shown below:
Figure 4-4:
Email menu
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•
Turn e-mail notification on
Check this box if you wish to receive e-mail logs and alerts from the router.
•
Send to this e-mail address
Enter the e-mail address to which logs and alerts are sent. This e-mail address will also be used
as the From address. If you leave this box blank, log and alert messages will not be sent via
e-mail.
•
Your outgoing mail server
Enter the name of your ISP’s outgoing (SMTP) mail server (such as mail.myISP.com). You
may be able to find this information in the configuration menu of your e-mail program. If you
leave this box blank, log and alert messages will not be sent via e-mail.
•
My Mail Server Requires Authentication
Select this checkbox and enter the user name and password for this email account, as required.
You can specify that logs are automatically sent to the specified e-mail address with these options:
•
Send alert immediately
Check this box if you would like immediate notification of attempted access to a blocked site.
•
Send logs according to this schedule
Specifies how often to send the logs: None, Hourly, Daily, Weekly, or When Full.
–
Day for sending log. Specifies which day of the week to send the log. Relevant when the
log is sent weekly or daily.
–
Time for sending log. Specifies the time of day to send the log. Relevant when the log is
sent daily or weekly.
If the Weekly, Daily or Hourly option is selected and the log fills up before the specified
period, the log is automatically e-mailed to the specified e-mail address. After the log is sent,
the log is cleared from the router’s memory. If the router cannot e-mail the log file, the log
buffer may fill up. In this case, the router overwrites the log and discards its contents. If you
don't want logs sent, select None from the list in the Send Logs According To This Schedule
area. When you turn on e-mail notification and choose None in the Send Logs According to
this Schedule list, the alert is sent but not the log.
The TA612V adapter uses the Network Time Protocol (NTP) to obtain the current time and date
from one of several Network Time Servers on the Internet. In order to localize the time for your
log entries, you must specify your Time Zone:
•
Time Zone. Select your local time zone. This setting will be used for the blocking schedule
and for time-stamping log entries.
•
Daylight Savings Time. Check this box to automatically adjust for daylight savings time.

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