gistfile1.txt

root@raspberrypi:/etc# cat network/interfaces 
auto lo br0

iface lo inet loopback
pre-up iptables-restore < /etc/iptables.bridge.rules

allow-hotplug wlan0
iface wlan0 inet manual
wpa-roam /etc/wpa_supplicant/wpa_supplicant.conf

iface eth0 inet manual
iface eth1 inet manual
allow-hotplug eth1
iface br0 inet static
        bridge_ports eth0 eth1
        address 192.168.1.200
        network 192.168.1.0
        netmask 255.255.255.0
        broadcast 192.168.1.255
        gateway 192.168.1.254


root@raspberrypi:/etc# cat iptables.bridge.rules 
*nat
-A PREROUTING -i br0 -p tcp --dport 80 -j REDIRECT --to-port 3128
COMMIT