Security
65
N450 Wireless Router WNR2500
To delete a keyword or domain:
1. Select ADVANCED > Security > Block Sites.
The Block Sites screen displays.
2. Select the keyword or domain that you want to delete from the list.
3. Click the Delete Keyword button.
To delete all keywords and domains from the list, click the Clear List button.
4. Click the Apply button.
Note: If you have set up email notifications (see Security Event Email
Notifications on page 69), you can be notified when someone
attempts to access a blocked site.
You can exempt one trusted computer from blocking and logging. The computer you exempt
needs to have a fixed IP address.
To specify a trusted computer:
1. Select ADV
ANCED > Security > Block Sites.
The Block Sites screen displays.
2. Select the Allow trusted IP address to visit blocked sites check box.
3. In the
Trusted IP Address field, type the last octet of the IP address.
The first three octets of the IP address depend on the IP address that is assigned to the
router on the LAN Setup screen.
4. Click the Apply button.
Port Filtering to Block Services
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 service or 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 http://www.ietf.org/) identifies the service
numbers for many common protocols. These numbers are published in RFC1700, “Assigned
Numbers.”
Typically, authors of other applications choose service numbers for the
applications from the range 1024–65535. Although the router already holds a list of many
service port numbers, you are not limited to these choices. You can often find port number
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