Algumas coisas,
- você não vinculou sua ponte a um dispositivo
- Você ainda está tentando usar seu dispositivo Ethernet normalmente
tente isto: -
# vim /etc/network/interfaces
#The loopback network interface
auto lo
iface lo inet loopback
# The primary network interface
auto eth0
iface eth0 inet manual # set pass through and use br0 for networking
# Bridge setup
allow-hotplug br0
auto br0
iface br0 inet static
address 192.168.0.1
netmask 255.255.255.0
network 192.168.0.0
broadcast 192.168.0.255
gateway 192.168.0.254 # make sure this gateway address is correct
bridge_ports eth0 # bind to device here
bridge_stp off
bridge_fd 0
bridge_maxwait 0