Forward traffic from wlan0 to eth0 interface

ip_forward.md

Forward traffic from a laptop's eth0 to wlan0

###To laptop

Specify an IP address to eth0 (here 192.168.56.1)

sudo ifconfig eth0 192.168.56.1 netmask 255.255.255.0

Enable IP forwarding

sudo sysctl -w net.ipv4.ip_forward=1

Forward packets from eth0 to wlan0

sudo iptables -A FORWARD --in-interface eth0 -j ACCEPT
sudo iptables --table nat -A POSTROUTING --out-interface wlan0 -j MASQUERADE

###To device connected to laptop

Setup IP address for eth0,and add gateway

sudo ifconfig eth0 192.168.56.2 netmask 255.255.255.0
sudo route add default gw 192.168.56.1

On top you have stated: Forward traffic from wlan0 to eth0 interface
However on the file states the opposite. Which is correct?

It's wlan0 to eth0.

That works! What's the best way to have it persist between reboots?

Hi all.
How to forward all android(rooted device) traffic to Laptop?

Hi valp124 and any other, out there. Just for the records, if someone looks for the same infos :)

1st to make iptables rules persistent, install the "iptables-persistent" package, avaiable on every common linux distro
this will add your current tables to an autostart script

2nd to make routing persistent, edit /etc/sysctl.conf and add or modify following entry to "net.ipv4.ip_forward = 1"
think is verry common, checked with debian stretch

Cheers the-celtic

Thanks

Thank you very much. I just wanted to connect mobile hotspot to a laptop via an Ethernet cable directly without a router.Many suggestions in Google are very elaborate. I just added ipforwarding and iptable commands as per your suggestion. I have already configured both the Ethernet interfaces. It worked beautifully. Thanks again.

I have created a generic script to which can simply provide 2 args, one for master interface from which you want to forward and the slave interface which is supposed to receive traffic from master. Check it out https://github.com/amoldhamale1105/BeagleboneLab/blob/master/usbnet.sh