Linksys BEFSR81 manual Filter IP Address Range, Filter Port Range, Filter MAC Address

EtherFast Cable/DSL Router with 8-Port Switch

Filter IP Address Range

To set up a filter using IP addresses, enter the range of IP addresses you wish to filter in the Start and End fields. Users who have filtered IP addresses will not be able to access the Internet at all. If you only want to filter one IP address instead of a range of IP addresses, enter the same value into both fields. For instance, if you wish to filter the PC with the IP address of 192.168.1.5, enter 5 into both fields on one line: 192.168.1.5 ~ 192.168.1.5.

Filter Port Range

To filter users by network port number, select the protocol you want to filter, TCP, UDP, or Both, in the Protocol drop-down box. Enter the port numbers you want to filter in the Start and End fields. Users connected to the Router will no longer be able to access any port number listed there.

Filter MAC Address

This feature blocks computers with specific MAC addresses from going out to the Internet. For information on obtaining a MAC address, go to “Appendix C: Finding the MAC Address and IP Address for Your Ethernet Adapter.” To set the MAC filter, click the Edit MAC Filter Setting button.

•Edit MAC Filter Setting. Click the Edit MAC Filter Setting button to display Figure 7-16. Select the range of MAC address entries in the drop-down box. In each mac field, enter the MAC address you want to filter. Click the Apply button before closing the window. To cancel changes, click the Undo button.

Block WAN Requests

Use these features to enhance your network’s security and filter multicasting.

•Block Anonymous Internet Requests. This keeps your network from being “pinged” or detected and reinforces your network security by hiding your network ports, so it is more difficult for intruders to work their way into your network. Select Enabled to block anonymous Internet requests, or Disabled to allow anonymous Internet requests.

•Filter Multicast. Multicasting allows for multiple transmissions to specific recipients at the same time. If multicasting is permitted, then the Router will allow IP multicast packets to be forwarded to the appropriate computers. Select Enabled to filter multicasting, or Disabled to disable this feature.

When finished making your changes on this tab, click the Save Settings button to save these changes, or click the Cancel Changes button to undo your changes. For further help on this tab, click the Help button.

Chapter 7: Using The Router’s Web-based Utility

Figure 7-15: Filter

Figure 7-16: MAC Filter Setting

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Filter