Enabling network interfaces with no IP address

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Note: RHEL 5 is used in this example.

Example /etc/sysconfig/network-scripts/ifcfg-eth1:

# Intel Corporation 82546EB Gigabit Ethernet Controller (Copper)
DEVICE=eth1
ONBOOT=yes
BOOTPROTO=none
HWADDR=MAC address

Note that BOOTPROTO should either be none, or the line should not exist altogether. If BOOTPROTO is set to bootp or dhcp, and the boot protocol fails, the network interface will not be enabled.

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