With the below mentioned configuration, bridging works on our setup with 3.2.0-31
auto eth0 iface eth0 inet manual
auto br0 iface br0 inet dhcp bridge_ports eth0 bridge_fd 9 bridge_hello 2 bridge_maxwait 12 bridge_stp off
Kernel is 3.2.0-31-generic as mentioned below.
root@ubuntu:~# uname -r 3.2.0-31-generic
If you can send us your configuration may be we can try it on our setup.
With the below mentioned configuration, bridging works on our setup with 3.2.0-31
auto eth0
iface eth0 inet manual
auto br0
bridge_ ports eth0
bridge_ hello 2
bridge_ maxwait 12
iface br0 inet dhcp
bridge_fd 9
bridge_stp off
Kernel is 3.2.0-31-generic as mentioned below.
root@ubuntu:~# uname -r
3.2.0-31-generic
If you can send us your configuration may be we can try it on our setup.