mous@mous-laptop:~$ sudo iwconfig
lo        no wireless extensions.

eth0      no wireless extensions.

eth1      unassociated  ESSID:off/any
          Mode:Managed  Frequency=nan kHz  Access Point: Not-Associated
          Bit Rate:0 kb/s   Tx-Power:16 dBm
          Retry limit:15   RTS thr:off   Fragment thr:off
          Encryption key:off
          Power Management:off
          Link Quality:0  Signal level:0  Noise level:0
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:0   Missed beacon:0

sit0      no wireless extensions.

**************************************************************

mous@mous-laptop:~$ sudo ifconfig
eth0      Lien encap:Ethernet  HWaddr 00:16:36:77:68:70
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          Packets reçus:0 erreurs:0 :0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 lg file transmission:1000
          Octets reçus:0 (0.0 b) Octets transmis:0 (0.0 b)
          Interruption:177 Adresse de base:0x6000

eth1      Lien encap:Ethernet  HWaddr 00:13:02:4E:C5:21
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          Packets reçus:0 erreurs:0 :0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 lg file transmission:1000
          Octets reçus:0 (0.0 b) Octets transmis:0 (0.0 b)
          Interruption:169 Adresse de base:0x8000 Mémoire:52000000-52000fff

lo        Lien encap:Boucle locale
          inet adr:127.0.0.1  Masque:255.0.0.0
          adr inet6: ::1/128 Scope:Hôte
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          Packets reçus:417 erreurs:0 :0 overruns:0 frame:0
          TX packets:417 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 lg file transmission:0
          Octets reçus:20872 (20.3 KiB) Octets transmis:20872 (20.3 KiB)

**************************************************************

mous@mous-laptop:~$ cat /etc/network/interfaces
auto lo
iface lo inet loopback

auto eth0
iface eth0 inet dhcp

auto eth1
iface eth1 inet dhcp

auto eth2
iface eth2 inet dhcp

auto ath0
iface ath0 inet dhcp

auto wlan0
iface wlan0 inet dhcp

**************************************************************

mous@mous-laptop:~$ sudo ifdown eth0
Internet Systems Consortium DHCP Client V3.0.3
Copyright 2004-2005 Internet Systems Consortium.
All rights reserved.
For info, please visit http://www.isc.org/products/DHCP

Listening on LPF/eth0/00:16:36:77:68:70
Sending on   LPF/eth0/00:16:36:77:68:70
Sending on   Socket/fallback
DHCPRELEASE on eth0 to 10.0.0.138 port 67
send_packet: Network is unreachable
send_packet: please consult README file regarding broadcast address.

**************************************************************

mous@mous-laptop:~$ sudo ifup eth0
Internet Systems Consortium DHCP Client V3.0.3
Copyright 2004-2005 Internet Systems Consortium.
All rights reserved.
For info, please visit http://www.isc.org/products/DHCP

Listening on LPF/eth0/00:16:36:77:68:70
Sending on   LPF/eth0/00:16:36:77:68:70
Sending on   Socket/fallback
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 7
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 13
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 11
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 11
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 7
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 12
No DHCPOFFERS received.
No working leases in persistent database - sleeping.