why does my eth0 static ip address in centos 6 go missing?

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http://unix.stackexchange.com – I was messing around with KVM in CentOS 6.3 when I noticed I was having problems with the IP address of my principle network connection (eth0). I backed out my bridge and restored the network-script file for eth0 but the IP address still goes missing after reboot. At this point I have to return to the console and restart the "network" service. The address will then be restored but only until the next boot. I have turned off NetworkManager but this does not seem to help. The ifcfg is below: *DEVICE=eth0 ONBOOT=yes BOOTPROTO=static NM_Controlled=no IPADDR= NETMASK=255.255.255. (HowTos)