On 12/12/2015 05:41 AM, Günther J. Niederwimmer wrote: > The problem I found now, is I have only a eth0, eth1 configured but I found now > a eth2 (??????) and the eth1 is not working next boot I have a eth3 ....... It wasn't clear that you were talking about KVM *guests* before. Are the ethernet addresses changing between boots? If you run "ifconfig -a | grep ether" does the output change from one boot to another? What do you get from "virsh dumpxml <guest>" in the KVM host?