I have the same problem with rhel 6.
After shutdown or reboot, must type "ifup eth0".
Edit configuration in /etc/sysconfig/network-scripts/ifcfg-eth0,
change ONBOOT=yes, BOOTPROTO=static.
Quote:
DEVICE=eth0
HWADDR=xx:xx:xx:xx:xx:xx
NM_CONTROLLED=yes
ONBOOT=yes
BOOTPROTO=static
TYPE=Ethernet
DNS1=192.168.1.x
IPV6INIT=no
USERCTL=no
IPADDR=192.168.1.x
NETMASK=255.255.255.0
GATEWAY=192.168.1.x
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