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Source MAC Filtering
Source MAC Filtering allows you to filter out traffic coming from certain known machines or devices. The router uses the MAC address of a computer or device on the network to identify it and block or permit the access. Traffic coming in from a specified MAC address will be filtered depending  upon the policy.
MAC Filtering Table
Enable Source MAC Filtering by selecting Yes. Disable Source MAC Filtering by selecting the No radio button.

MAC Filtering has two policies 1)Block and Permit the rest 2)Permit and Block the rest. If you choose the option Block and Permit the rest, the router blocks the traffic from the following MAC addresses and allows other. If you choose the option Permit and Block the rest, the  router permits the traffic from the following MAC addresses and blocks other machines which are on the LAN side of the router .

Example: If two computers are on the LAN with MAC addresses of 00:01:02:03:04:05(host1),00:01:02:03:04:11(host2) .If host1 MAC address is added to the MAC filtering list and you choose the policy Block and Permit the rest, when this computer tries to connect to www.yahoo.com (or any other website), the router will not allow it to connect but host2 will be  able to connect. If we choose the policy Permit and Block the rest then host1 will be able to connect to www.yahoo.com (or any other website)  but host2 cannot. However, if this computer is running some server (e.g., an FTP server), and a firewall rule is defined that directs all FTP traffic to this machine (if under NAT mode), any machine on the Internet will be able to make the FTP connection and upload or download any file successfully.
Available MAC Addresses
This table lists the MAC Addresses to which policies can be applied. Depending on our requirement you can enable any one of the two policies for the MAC addresses. To remove an entry from the table, select the MAC Address entry and click Delete. To edit an entry, click Edit adjacent to the entry.
To select all the MAC addresses in the table, click Select All.
Add Source MAC Address :
To add a MAC Address to the table, input a valid MAC address in the MAC Address field and click Add. MAC addresses are in the form: xx:xx:xx:xx:xx:xx where x is a numeric (0 to 9) or an alphabetic (between a and f inclusive); for example: 00:e0:4c:69:0a:11
Click Apply to submit your changes.
Click Reset to revert back to the previous settings.
 

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