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To find your Xbox's MAC address so you can register for the SMCC-Gaming network, do the following.
1. Start the Xbox. Once it is at the home screen, press the home (Xbox logo) button on the controller.
2. Press RB to get to the System tab and go to Settings
3. Go to Network Settings
4. Under Set up wireless network, go to Advanced settings
5. Your MAC address will be shown. NOTE: Be sure to register the wireless MAC and not the wired MAC. Registration is not required for devices that are plugged in to SMCC's wired network.
Note: If you have a custom MAC address configured in the Alternate MAC address screen, you may experience problems connecting. Do not attempt to duplicate another device's MAC address as only one device at a time will be able to connect.
Once you have the MAC address, return to the registration page and enter it when requested. See this article.