Running a Raspberry Pi Wi-Fi Bridge

A Raspberry Pi Wi-Fi bridge is one of the best ways of providing internet access to a device that only supports an Ethernet connection.

In this tutorial, we will show you how to setup a Wi-Fi bridge using network manager on your Raspberry Pi. Network Manager is a useful tool that makes managing connections a straightforward process.

You will need to keep in mind that you will not see speeds as good as what you would with a direct connection to your router. As there is some overhead with the connection having to run through the Raspberry Pi.

Remember to do this tutorial you will need either a Wi-Fi dongle or a Raspberry Pi 3 with the inbuilt Wi-Fi module.

This tutorial can be combined with our basic VPN access point, you can find the tutorial on how to set that up directly after this tutorial. Basically, it will show how to setup a OpenVPN client and redirect all traffic through that client.

Please note: This tutorial will require some slight changes if you decide to go down the VPN route, we will explain the necessary changes needed at the end of this tutorial.

Equipment List

Below are all the bits and pieces that I used for this Raspberry Pi Wi-Fi bridge tutorial, you will need A Wireless internet connection to be able to complete this tutorial.

Recommended

• Raspberry Pi ( Amazon | SunFounder )
• Micro SD Card ( Amazon | SunFounder )
• Wi-Fi ( Amazon | SunFounder )
• Ethernet Cable ( Amazon )

Optional

• Raspberry Pi Case ( Amazon | SunFounder )

Setting up the Wi-Fi Bridge using your Raspberry Pi

In this section, we will show you how easy it is to set up a Wi-Fi bridge on your Raspberry Pi.

This bridge allows you to easily share your Wi-Fi connection with any connected ethernet device. Thanks to Network Manager, this whole process is made relatively easy.

Since Bookworm, all versions of Raspberry Pi OS have Network Manager installed by default. If you are using an older release of Pi OS, follow our guide on installing Network Manager.

Preparing your Raspberry Pi

1. Before setting your Raspberry Pi to act as a Wi-Fi bridge, we will want to ensure that the operating system is up-to-date.

You can update the package list and upgrade any out-of-date packages by running the following commands.

sudo apt update
sudo apt upgrade

2. Once your Raspberry Pi is up-to-date, the only other thing you will need to set up is a Wi-Fi connection.

If you haven’t connected to your Wi-Fi yet be sure to follow guide.

Finding your Ethernet Device Name

3. Once you have a Wi-Fi connection set up on your Raspberry Pi, we will need to get the name of your ethernet adapter.

Typically, the Ethernet device is called “eth0” but this isn’t always the case. Luckily, we can double-check by using the “ifconfig” command.

ifconfig

You will get a list of devices like we have shown below using this command. Look for your ethernet connection, then continue. In our example, this Ethernet device has the name “eth0” as expected.

eth0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        ether d8:3a:dd:a2:06:0f  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
        device interrupt 106

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 16  bytes 2038 (1.9 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 16  bytes 2038 (1.9 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

wlan0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.0.34  netmask 255.255.255.0  broadcast 192.168.0.255
        inet6 fe80::f0de:cd26:d200:e53f  prefixlen 64  scopeid 0x20<link>
        inet6 2406:2d40:4114:f200:9f3e:4293:b1f:8d94  prefixlen 64  scopeid 0x0<global>
        inet6 fd0b:3f38:7421:cd40:aa94:eed9:534f:b056  prefixlen 64  scopeid 0x0<global>
        ether d8:3a:dd:a2:06:10  txqueuelen 1000  (Ethernet)
        RX packets 634  bytes 205247 (200.4 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 288  bytes 40214 (39.2 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

Creating the Wi-Fi to Ethernet Bridge on your Raspberry Pi

4. Once you know the name of your Raspberry Pi’s ethernet device you can continue with setting up a Wi-Fi bridge. Thanks to use using the Network Manager, creating the Wi-Fi bridge is as simple as using the following command within the terminal.

• <INTERFACE>: You must replace this with the device name for your ethernet connection. Typically, this will be “eth0“.

sudo nmcli c add con-name wifibridge type ethernet ifname <INTERFACE> ipv4.method shared ipv6.method ignore

5. Once you have created the new connection, you must turn it on by using the following command in the terminal.

After enabling this bridge, your Raspberry Pi’s Wi-Fi will immediately begin to be shared through the ethernet connection. If you have a device connected, you should now have access to the internet. The device will also have a local IP address handed to it by the Pi.

sudo nmcli con up wifibridge

6. You can check that the Wi-Fi bridge is active from your Pi by using the following command.

nmcli con show

This command will show you a list of connections on your Pi. You should see a connection labeled “wifibridge” and that it is using the “eth0” device.

NAME                UUID                                  TYPE      DEVICE
wifibridge          0120ca82-63e9-403d-aa45-c31ed08bec53  ethernet  eth0
preconfigured       6e07c33c-9764-4145-af3f-49875c8a9342  wifi      wlan0
lo                  a54edcc4-0ffa-4090-a2b3-081905aee1c5  loopback  lo
Wired connection 1  9d27eb3e-7657-3a54-ad8a-344cb4bb56e3  ethernet  --

Setting up the Raspberry Pi Wi-Fi Bridge with a VPN

This tutorial is fully compatible with the basic VPN router tutorial.

However, there is one small change you will have to make in step 13, rather than using the commands showcased there, run the commands below.

Basically, the main change you will see here is that instead of redirecting the traffic from wlan0 through the tunnel we will be redirecting the traffic from our eth0 connection to the tunnel.

sudo iptables -t nat -A POSTROUTING -o tun0 -j MASQUERADE
sudo iptables -A FORWARD -i tun0 -o eth0 -m state --state RELATED,ESTABLISHED -j ACCEPT
sudo iptables -A FORWARD -i eth0 -o tun0 -j ACCEPT

The rest of the VPN Access Point tutorial can be done without any other changes.

Conclusion

Hopefully by now you should have a fully operational Raspberry Pi Wi-Fi Bridge.

If you come across any issues or have some feedback related to this tutorial, then please don’t hesitate to leave a comment below.

If you found this tutorial to be helpful, please check out our many other Raspberry Pi projects.

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