$ sudo iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
$ sudo iptables -A FORWARD -i eth0 -o wlan0 -m state --state RELATED,ESTABLISHED -j ACCEPT
$ sudo iptables -A FORWARD -i wlan0 -o eth0 -j ACCEPT

apt-get install bridge-utils

brctl addbr bridge0
brctl addif bridge0 wlan0
brctl addif bridge0 wlan1
ifconfig bridge0 up

dhclient bridge0