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ReadySHARE Printer
66
R6200v2 Smart WiFi Router
3.
Click the
Network Scanner
button.
The scanner window opens so that you can use the USB printer for scanning.
Page 67 / 131
67
7
7.
Security
Customizing the firewall settings
This chapter explains how to use the basic firewall features of the router to prevent objectionable
content from reaching the computers and devices on your network.
This chapter includes the following sections:
•
Keyword Blocking of HTTP Traffic
•
Block Services (Port Filtering)
•
Port Triggering to Open Incoming Ports
•
Port Forwarding to Permit External Host Communications
•
How Port Forwarding Differs from Port Triggering
•
Set Up Port Forwarding to Local Servers
•
Set Up Port Triggering
•
Schedule Blocking
•
Set Up Security Event Email Notifications
For information about Live Parental Controls, see
Parental Controls
on page
22.
Page 68 / 131
Security
68
R6200v2 Smart WiFi Router
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 set up keyword blocking:
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.
(See
Schedule Blocking
on page
77.)
•
Always
. Turn on keyword blocking all the time, independent of the Schedule screen.
3.
In the Keyword field, enter a keyword or domain, click the
Add Keyword
button.
4.
Click the
Apply
button.
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 the
Delete Keyword
button.
3.
Click the
Apply
button.
Your changes are saved.
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.
Page 69 / 131
Security
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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
) 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.
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Security
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R6200v2 Smart WiFi Router
The Block Services Setup screen displays:
5.
From the Service Type list, select the application or service to allow or block.
The list 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
TCP/UDP
(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 the
Add
button.
Your changes are saved.
Port Triggering to Open Incoming Ports
Some application servers (such as FTP and IRC servers) send replies to multiple port
numbers. Using the port triggering function of your router, you can tell the router to open
more incoming ports when a particular outgoing port originates a session.
An example is Internet Relay Chat (IRC). Your computer connects to an IRC server at
destination port 6667. The IRC server not only responds to your originating source port, but
also sends an “identify” message to your computer on port 113. Using port triggering, you can
tell the router, “When you initiate a session with destination port 6667, you have to also allow
incoming traffic on port 113 to reach the originating computer.” Using steps similar to the

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