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By default, the "Obtain IP automatically (DHCP) option is selected. If you wish to manually set your IP address, uncheck this box and type in the IP address and double-check that the subnet mask (Netmask) is correct.
By default, the "Disable this network device" box is unchecked. If you do not want this interface card to receive an address when you reboot, uncheck this box. If you decide you do want to activate this card, you can recheck this box.