After a couple of reboots ( too "cycle" trough the nics ) my configuration was correct, my etc/sysconfig/network-scripts/ifcfg-* files where all in order. ( with correct mac address ) But this file dont excist on any of my nodes: /etc/udev/rules.d/70-persistent-net.rules So i generated it with : echo add > /sys/class/net/eth0/uevent echo add > /sys/class/net/eth1/uevent echo add > /sys/class/net/eth2/uevent Reboot no difference. Tried: mount -o rw,remount / before all the changes also on my second run.. But the change is not persistent. Anything special i need to do to keep this file? /etc/udev/rules.d/70-persistent-net.rules Thanks for your time :) -Espen