Comment 9 for bug 279262

Here are my /etc/network/interfaces :

auto lo
iface lo inet loopback

auto eth0
iface eth0 inet static
address 192.168.2.136
netmask 255.255.255.0
gateway 192.168.2.1

iface wlan0 inet static
address 192.168.2.136
netmask 255.255.255.0
gateway 192.168.2.1
wireless-key ***********
wireless-essid Broadcast

auto wlan0

auto eth0

and /etc/NetworkManager/nm-system-settings.conf

[main]
plugins=ifupdown,keyfile

[ifupdown]
managed=false