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Forward traffic from wlan0 to eth0 interface

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
@moinahmed001

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commented Sep 28, 2016

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

@Keftaa

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commented Nov 20, 2016

It's wlan0 to eth0.

@valp124

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commented Sep 22, 2017

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

@henrytom1703

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commented Apr 25, 2018

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

@the-celtic

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commented Jun 12, 2018

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

@rashid4c7

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commented Jul 7, 2019

Thanks

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