iptables bridge

#first run this:
echo "1" > /proc/sys/net/ipv4/ip_forward
echo "1" > /proc/sys/net/ipv4/ip_dynaddr




#these are the rules, set the up in iptables and then make them permanent either using an init.d script or using rc.local

#this allows NAT
iptables -t nat -A POSTROUTING -j MASQUERADE

#These forward packets from one interface to another INTIF is a placeholder for the internal and EXTIF is the external (ues eth0/wlan0 in their place)
iptables -A FORWARD -i $EXTIF -o $INTIF -j ACCEPT
iptables -A FORWARD -i $INTIF -o $EXTIF -j ACCEPT