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RangeMax™ Wireless-N Gigabit Router with USB WNR3500L User Manual
Protecting Your Network 3-7
v1.0, November 2009
3. Specify a service for blocking by clicking Add. The Block Services Setup screen displays.
4. 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.
5. Select the radio button for the IP address configuration you want to block, and then enter the
IP addresses in the appropriate fields.
You can block the specified service for a single computer, a range of computers (having
consecutive IP addresses), or all computers on your network.
6. Click Add to enable your Block Services Setup selections.
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 port 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. You can often determine port number information by contacting the publisher of
the application, by asking user groups or newsgroups, or by searching.
• Enter the starting port and ending port numbers. If the application uses a single port number,
enter that number in both fields.
• If you know that the application uses either TCP or UDP, select the appropriate protocol. If
you are not sure, select Both.
Figure 3-7