Netgear WNR2500 User Manual - Page 65

Port Filtering to Block Services, Clear List

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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 ADVANCED > 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 Security 65

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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
ADVANCED > 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
) 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