Hi!, Yesterday one of my servers went down and I had to move the hard drive to another identical machine. The server was running Debian. The server was using the network card as eth0. After replacing the 'bad' server I could not get the network up again. (it could not find eth0) After a lot of testing, I managed to get Debian to see the new network card as eth2. (I set it in /etc/networking/interfaces) Here is /etc/networking/interfaces here is the output from /etc/udev/rules.d/70-persistent-net.rules : Anyone here who might know what is causing this, and how to set it to see the network card again as eth0? Thank you very much for your help!.