tzermias/ip_forward.md

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Forward traffic from wlan0 to eth0 interface

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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

rashid4c7 commented Jul 7, 2019

Thanks

vsayanam commented Jul 14, 2020

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.

amoldhamale1105 commented Apr 24, 2023

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