/Nat-wlan0-to-eth0

Forward internet from wlan0 to eth0 in Debian

Nat-wlan0-to-eth0

Forward Internet From wlan0 to eth0 in Debian

To Target Board(It is only eth0)

In our target board not wlan0 interface only eth0 interface is there

so set ip address to eth0 (If you need sudo premission) (192.168.1.20 is your laptop ip)

sudo ifconfig eth0 192.168.1.20 netmask 255.255.255.0
sudo route add default gw 192.168.1.30

To laptop(It is wlan0 and eth0)

It need sudo privilege

sudo /etc/init.d/networking restart

above command is optional

sudo nano /etc/network/interfaces

and add the line

allow-hotplug wlan0

Is using nano ctrl-X,Y,Enter to save this

sudo ifconfig eth0 192.168.1.30 netmask 255.255.255.0

iptables -A FORWARD -o wlan0 -i eth0 -s 192.168.1.0/30 -m conntrack --ctstate NEW -j ACCEPT
iptables -A FORWARD -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
iptables -t nat -A POSTROUTING -o wlan0 -j MASQUERADE

Next ping in target board it is working

Reference https://www.raspberrypi.org/forums/viewtopic.php?t=7323&p=102166 https://gist.github.com/tzermias/5408466x