Public bug reported:

Since few days, when I turn on my laptop (Dell Inspiron 6000), I have
eth0 & eth1 active at boot, but only eth0 is used, eth1 is the wifi
card, and I don't use it.

So, I do a "sudo ifconfig eth1 down", but less than a minute later, eth1
has woke up.

But when I check just after typing the command, eth1 doesn't appears, so
she's inactive, and she turns on without any human action.

For help, I give you my /etc/network/interfaces, and my ifconfig with
eth0 and eth1 up.

/etc/network/interfaces :

[EMAIL PROTECTED]:/# cat /etc/network/interfaces 
auto lo
iface lo inet loopback

auto eth0
iface eth0 inet static
address 192.168.0.2
netmask 255.255.255.0
gateway 192.168.0.1

#auto eth1
#iface eth1 inet dhcp

#auto eth2
#iface eth2 inet dhcp

#auto ath0
#iface ath0 inet dhcp

#auto wlan0
#iface wlan0 inet dhcp


ifconfig with eth0 and eth1 up : 

[EMAIL PROTECTED]:/etc# ifconfig
eth0      Lien encap:Ethernet  HWaddr 00:11:43:76:F8:EF  
          inet adr:192.168.0.2  Bcast:192.168.0.255  Masque:255.255.255.0
          adr inet6: fe80::211:43ff:fe76:f8ef/64 Scope:Lien
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          Packets reçus:16553 erreurs:0 :0 overruns:0 frame:0
          TX packets:10968 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 lg file transmission:1000 
          Octets reçus:21587912 (20.5 MiB) Octets transmis:867690 (847.3 KiB)
          Interruption:201 

eth1      Lien encap:Ethernet  HWaddr 00:12:F0:41:E2:98  
          inet adr:192.168.0.31  Bcast:192.168.0.255  Masque:255.255.255.0
          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:0xe000 Mémoire:dfdfd000-dfdfdfff

** Affects: Ubuntu
     Importance: Undecided
         Status: Unconfirmed

-- 
eth1 interface wakes up after sudo ifconfig eth1 down
https://launchpad.net/bugs/94713

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