The router's MAC address is a 12-digit code assigned to a unique piece of hardware for identification. Some ISPs require that you register the MAC address of your network card/adapter, which was connected to your cable or DSL modem during installation.
To clone your network adapter's MAC address onto the router, select Enable and enter your adapter's MAC address in the Clone WAN MAC field or click Get Current PC MAC Address to fill in the MAC address of your PC you are using. Then save your changes by clicking on the Save Settings button.

To disable MAC address cloning, keep the default setting, Disable.
Find your adapter's MAC address by following the instructions for your PC's operating system.

Windows 98 and Millennium:
  1. Click the Start button, and select Run.
  2. Type winipcfg in the field provided, and press the OK key.
  3. Select the Ethernet adapter you are using.
  4. Click More Info.
  5. Write down your adapter's MAC address.

Windows 2000 and XP:
  1. Click the Start button, and select Run.
  2. Type cmd in the field provided, and press the OK key.
  3. At the command prompt, run ipconfig /all, and look at your adapter's physical address.
  4. Write down your adapter's MAC address.
Check all values and click Save Settings to save your settings. Click Cancel Changes to cancel your unsaved changes.