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I'm currently experiencing a problem that seemingly lies with udev in Ubuntu 12.04.

I have numerous machines in the lab I am managing, all of which have been cloned from a single original master install, on 11 of the 12 machines networking works properly.

These machines with the exception of their hostname and IP should be identical as all user data is stored on a network share. However on a single machine udev appears to incorrectly configure the network hardware on subsequent reboots.

If I delete /etc/udev/rules.d/70-persistent-net.rules then reboot the machine my ethernet interface is correctly configured with my ethernet adapter (Intel 82579LM) showing up as eth0. However the next time the machine is rebooted the network connection is incorrectly configured once again showing only the local loopback (lo).

I'm tempted to re-clone the machine but would like to figure this problem out in case it crops up again (and to satisfy my own curiosity).

Has anyone else here experienced this or a similar issue? If my description of the problem is in anyway deficient please let me know.

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