me@debian:~$ su
Mot de passe :
debian:/home/me# ifdown eth0
ifdown: interface eth0 not configured
debian:/home/me# ifup eth1
Internet Systems Consortium DHCP Client V3.0.6
Copyright 2004-2007 Internet Systems Consortium.
All rights reserved.
For info, please visit http://www.isc.org/sw/dhcp/

SIOCSIFADDR: No such device
eth1: ERROR while getting interface flags: No such device
eth1: ERROR while getting interface flags: No such device
Bind socket to interface: No such device
Failed to bring up eth1.