voilà le resultat:
# Used by ifup(8) and ifdown(8). See the interfaces(5) manpage or
# /usr/share/doc/ifupdown/examples for more information.

iface lo inet loopback
address 127.0.0.1
netmask 255.0.0.0
broadcast 127.255.255.255
network 127.0.0.0

auto lo

iface eth0 inet static
name Carte Ethernet
address 192.168.1.1
netmask 255.255.255.0
broadcast 192.168.0.255
network 192.168.1.1

auto eth0
iface eth0 inet dhcp

(Merci d'avoir été aussi rapide)