On Wed, 2010-11-10 at 10:16 +0100, Mathieu Baudier wrote: > So, it seems that Ubuntu and CentOS somehow conflicted in their > management of the network card. > I don't understand how it is possible though, since the machine is > rebooted (I also did some tests, where I was cuttin all power supply, > in order to be sure that the motherboard was completely shut off). --- Believe it not it is actually possible to do so. I have seen this happen a lot duel booting windows then linux. Linux then not wanting to start the network or the windows machine also. You need to do a complete shutdown then power back on for the card to "reset". Or leave it off a while. It is a real problem though. It could also be a fact that the driver is not doing a complete shutdown also. John