Today I needed to change a network card on one of my Debian Lenny severs. The server was using the network card as eth1. After replacing the 'bad' card I could not get the network up again. (it could not find eth1) After a lot of testing things I managed to get Lenny to see the new network card as eth2. (I set it in /etc/networking/interfaces) As this card was also not working the way I wanted, I changed it again to a new network card. Again I had the same problem. No way that I could get it to work as eth1 OR eth2. After setting it to eth3 in interfaces all was working fine again..... Anyone here who might know what is causing this, an how to set it to see the new (now set to eth3) network card again as eth1?