ReadySHARE Printer

61

AC1450 Smart WiFi Router

Once the printer shows Available status, it is no longer grayed out in a Paused state in the

Windows Printers and Faxes window.

Figure 9. Printers and Faxes window

This USB printer is ready. The utility does not need to hold the connection of this USB printer.

Once there is any print job for this printer, the USB utility connects to this USB printer

automatically and prints. After the print job is done, the printer status returns to the Paused

state.

Scan with a Multifunction Printer

You can use the scan feature of a multi-function printer.

1.

Make sure that the printer status shows as Available.

2.

Click the

Network Scanner

button.

This activates the scanner window to perform scans.

62

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

•

Security Event Email Notifications

For information about Live Parental Controls, see

Parental Controls

on page

22.

Security

63

AC1450 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.

•

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 XXX to block http://www.badstuff.com/xxx.html.

•

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

.

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.

2.

Click

Apply

.

Your changes are saved.

Security

64

AC1450 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, 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 to 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.

Security

65

AC1450 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

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

.

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

preceding example, the following sequence shows the effects of the port triggering rule you

have defined:

1.

You open an IRC client program to start a chat session on your computer.