Exemple : iptables forwarding between two interface

echo 1 > /proc/sys/net/ipv4/ip_forward

iptables -A FORWARD -i wlan1 -o wlan0 -j ACCEPT

iptables -A FORWARD -i wlan0 -o wlan1 -m state --state ESTABLISHED,RELATED  -j ACCEPT

iptables -t nat -A POSTROUTING -o wlan0 -j MASQUERADE