I have a pi running the latest release of raspbian and it's connected to the Internet using a wireless USB dongle. What I would like to do, is to share the pi's wifi connection so that any computer connected to the pi using a LAN cable would be able to receive the Internet. I had a look around the Internet but I can't seem to find anything of relevance. I'm familiar with this process on Windows and Mac OS X, but doing this on the pi has just got me stumped.

EDIT: I don't know whether this helps anyone but I am connected to the Internet on my pi via wlan0, but I would like to share that Internet connection via eth0.

  • Bridging your WiFi and Ethernet connections on the Pi and plugging it into a router would be simpler. Is this possible for your application?
    – tlhIngan
    Jun 3, 2016 at 18:23
  • @tlhIngan unfortunatly not, you see I don't have access to any Ethernet sockets and I need to boot my laptop from PXE, which has to be done by Ethernet. Also I want to learn more about Linux, and I thought building this project would give me a bit more confidence with Linux. I thought this would be an easier solution as my router is all the way across my house :/ Anyway, thanks for your reply.
    – user47488
    Jun 4, 2016 at 8:07
  • I found this tutorial video exactly what you need: youtu.be/IAa4tI4JrgI The Raspberry PI shares internet it gets from wifi to Ethernet port.
    – Mia19
    Nov 22, 2016 at 12:19
  • @tlhIngan - Can you elaborate? Would creating a bridge require a router too? I want my network audio receiver to share my Pis WiFi over Ethernet and be on the same subnet and DHCP as my main router. Feb 8, 2018 at 9:19

2 Answers 2


For Raspbian Jessie

From this document:

We will use dnsmasq package for this purpose because it is combined DHCP and DNS server and also easy to configure.

If you want something a little more 'heavyweight', you can use the isc-dhcp-server and bind9 packages for DHCP and DNS respectively, but for our purposes, dnsmasq works just fine.

sudo apt-get install dnsmasq

We need to configure interfaces. We will assign a static IP address to eth0 which will be used as gateway. Open the interfaces file

sudo nano /etc/network/interfaces

Edit the eth0 section like this:

allow-hotplug eth0  
iface eth0 inet static  

Next, we will configure dnsmasq. The shipped dnsmasq config file contains a lot of information on how to use it. So, I will advise to move it and create a new one.

sudo mv /etc/dnsmasq.conf /etc/dnsmasq.conf.orig  
sudo nano /etc/dnsmasq.conf

Paste the following into the new file

interface=eth0      # Use interface eth0  
listen-address= # listen on  
# Bind to the interface to make sure we aren't sending things 
# elsewhere  
server=       # Forward DNS requests to Google DNS  
domain-needed        # Don't forward short names  
# Never forward addresses in the non-routed address spaces.
# Assign IP addresses between and with a
# 12 hour lease time

Edit the /etc/sysctl.conf file to enable packet forwarding

sudo nano /etc/sysctl.conf

Remove the # from the beginning of the line containing net.ipv4.ip_forward=1 This will enable packet forwarding on next reboot. But if you want to try it right now without reboot then do this.

sudo sh -c "echo 1 > /proc/sys/net/ipv4/ip_forward"

We also need to share RPi’s internet connection with the devices connected over Wi-Fi. We will configure a NAT between eth0 and wlan0:

sudo iptables -t nat -A POSTROUTING -o wlan0 -j MASQUERADE  
sudo iptables -A FORWARD -i wlan0 -o eth0 -m state --state RELATED,ESTABLISHED -j ACCEPT  
sudo iptables -A FORWARD -i eth0 -o wlan0 -j ACCEPT  

However, we need these rules to be applied every time we reboot the Pi, so run sudo sh -c "iptables-save > /etc/iptables.ipv4.nat" to save the rules to the file /etc/iptables.ipv4.nat. Now we need to run this after each reboot, so open the /etc/rc.local file with sudo nano /etc/rc.local and just above the line exit 0, add the following line:

iptables-restore < /etc/iptables.ipv4.nat  

And that’s all! Now just Reboot your RPi and you will be able to access Internet

sudo reboot

Updated for Raspbian Stretch

Above configuration won't work in newer version of Raspbian. So, I have created a script for this which make it possible in less pain.

Connect to WiFi network using this guide.

Download the script from here. Place it at /home/pi/

Open up /etc/xdg/lxsession/LXDE-pi/autostart file

sudo nano /etc/xdg/lxsession/LXDE-pi/autostart

Add the last line :

@lxpanel --profile LXDE-pi
@pcmanfm --desktop --profile LXDE-pi
@xscreensaver -no-splash
sudo bash /home/pi/wifi-to-eth-route.sh

Make sure you have given full path to the file. And you're done. Now reboot to see the changes

sudo reboot
  • 1
    Thank you very much. Just tested this out on my pi and the connection was fine! Again thanks for your time. I appreciate it.
    – user47488
    Jul 21, 2016 at 17:34
  • 1
    This is excellent for sharing internet connection with a wireless device. However, I want to access the device from another laptop in my network and that doesn't work. I guess it's because they're in different subnets? Any tip to get around it? Mar 18, 2017 at 13:40
  • 1
    It worked perfectly, although under Raspbian Stretch, I had to manually include the WiFi configuration into the /etc/network/interfaces
    – xfx
    Sep 14, 2017 at 9:49
  • 1
    @xfx, could you please show the code you added for the WiFi config?
    – karl71
    Nov 10, 2017 at 21:26
  • 1
    I followed your post and the link carefully. My Pi (just did a fresh OS install), whenever I add the "static" word, it's not even able to connect to the wifi...
    – karl71
    Nov 11, 2017 at 9:45

Being your purpose provide internet access to your LAN devices, will assume double 'NAT' will not be a big issue.
With this configuration you will provide wireless access to non WiFi devices that will benefit from internet access.


Make sure your Wi-Fi is properly configured and working. if something goes bad your access to the device through `eth0` will be limited or inexistent.


We need a couple of packages to start:
apt-get update
apt-get install network-manager isc-dhcp-server


edit the file `/etc/network/interfaces` to match the following, this will set your eth0 a fix ip address ( and will recreate `resolv.conf`.
auto lo
iface lo inet loopback

iface default inet dhcp

allow-hotplug eth0
iface eth0 inet static

auto wlan0
allow-hotplug wlan0
iface wlan0 inet dhcp
  wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf
  up cat /etc/resolv.conf | sed 's/ver /ver,/g' > /etc/resolv_local.conf
  up cat /etc/resolv.conf | sed 's/ver /ver,/g' > /etc/resolv.conf


Modify default `dhcp` configuration to make it authoritative and add the LAN network (10.10.10.*), edit the file `/etc/dhcp/dhcpd.conf`, add the following content:
# configuration for the bridge internal subnet.
subnet netmask {
  option domain-name-servers;
  option domain-name "domain.local";
  option routers;
  default-lease-time 600;
  max-lease-time 7200;


Now create the following script to setup and start the network on every reboot. The script will dynamically create a few 'IPTABLES' rules. Name it `/root/bridge.sh`:

# this is where the dhcp info comes in. We need the default gateway
# /var/lib/dhcp/dhclient.wlan0.leases
GATEWAY=$(cat $f| grep "option route" | tail -1 |awk '{print $3}'| sed 's/;//')

IPT=$(which iptables)
# get the wlan address
INET_ADDRESS=$(ifconfig $INET_IFACE |grep "inet addr" |awk '{print $2}' |awk -F$

# Flush the tables
$IPT -t nat -F


# Allow forwarding packets:

# Packet masquerading

# save the created tables 
iptables-save > /etc/network/iptables

#cat /proc/sys/net/ipv4/ip_forward
# make sure we are forwarding packets
echo "1" > /proc/sys/net/ipv4/ip_forward
sysctl --system > /dev/nul

#remove the default route, usually on eth0 interface
route del default
#ifdown $INET_IFACE  && ifup $INET_IFACE
#ensure is $INET_IFACE now...
route add default gw $GATEWAY $INET_IFACE
gw=$(route -n -A inet | grep '^' |awk '{ print $2 }')
echo "default route is now " $gw


Finally, you need to run the script on each reboot, add the following two lines before the `exit 0` on the file `/etc/rc.local' to run the script created before.
# will run the bridge on startup
sudo ./root/bridge.sh

Now, just restart your device and the bridge will be working for you.

pd: sudo was omitted for brevity. Use sudo -iE to have a session as root

  • Wow! Thank you very much for such a detailed answer! I never realised it would be that complicated, but I think I can tackle it. Again thanks, I'll try it out in a couple of hours and if it works I'll mark you as the answer. Thanks so much
    – user47488
    Jun 4, 2016 at 7:59
  • @GrowlingSolid It should not be that complicated. The answer has you use network-manager to manage networks, which is incompatible with dhcpcd, which is the default for Raspbian. There is nothing wrong with using an alternate manager, but you should disable dhcpcd (the answer does this indirectly as dhcp will cause dhcpcd to stop). It will also prevent the WiFi support in the GUI from working.
    – Milliways
    Jun 26, 2016 at 4:27
  • 2
    I've informed myself and came to this correct line instead of yours: INET_ADDRESS=$(ifconfig $INET_IFACE |grep "inet addr" |awk '{print $2}' | awk -F ":" '/1/ {print $2}') Your "false" Version was: INET_ADDRESS=$(ifconfig $INET_IFACE |grep "inet addr" |awk '{print $2}' |awk -F$
    – Luke_R
    Dec 6, 2017 at 18:26
  • 2
    Is the dhcpd.conf option routers supposed to be or Typo?
    – David
    Aug 21, 2020 at 23:57
  • This requiree a bit of minor tweaking to work on my bullseye install on pi, but otherwise worked without any problems. Apr 13, 2022 at 13:52