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Start eth0 at boot Red Hat | CentOS | To have eth0 start at boot, edit the following file: $ sudo nano /etc/sysconfig/network-scripts/ifcfg-eth0 Change ONBOOT to “yes” DEVICE=”eth0″ BOOTPROTO=”dhcp” HWADDR=”08:00:27:CE:54:D9″ NM_CONTROLLED=”yes” ONBOOT=”yes” Done!