I followed the answer to this question:

Access point as WiFi router/repeater with additional WiFi-dongle

To have my 3 B+ act as a WiFi hotspot where wlan1 connects to the internet (WAN) and the pi acts as a router with devices connecting to wlan0 on the LAN side.

That works great but I also want to connect a LAN device to eth0

I think I just need to bridge eth0 and wlan0 but haven’t been able to make it work.

  • I will extend the setup you have used, with a bridge with wlan0 and eth0. Just a moment please. – Ingo Jun 25 at 8:20
  • An dhcp server must run on your AP for wireless clients private network (assume wlan0) and on Ethernet (assume eth0) for wire clients private network. I cannot help you because I'm not familiarized with the default dhcp server but if you use dnsmasq , then I can help you. But the steps are the same : 1) assign an ip address to wlan0 ( and eth0 ( interfaces. 2) Bind your dhcp server on this precise addresses and configure the 'client network' scope in configuration file. 3) start the DHCP daemon(s ?). – Ephemeral Jun 25 at 20:21
  • For dnsmasq I use two instance (yes two dhcp and dns server listening on two different network) for that. I exclude necessary interfaces in dnsmasq.conf for dhcp and dns, bind the interfaces on specific assigned ip addr .... and It's work for me. – Ephemeral Jun 25 at 20:22
  • @lngo - that would be very much appreciated. – William Meyer Jun 26 at 15:43

To bridge eth0 with wlan0 I will start with the setup you have already done with Access point as WiFi router/repeater with additional WiFi-dongle.

You will get this setup:

        from RPi)        bridge
           ╱    wifi    ┌───────┐
mobile-phone <~.~.~.~.> │(wlan0)│              wifi            wan
                        │    br0│RPi(wlan1) <.~.~.~.~> router <───> INTERNET
      laptop <────────> | (eth0)│╲       ╲
           ╲    wired   └───────┘╱      (dhcp
         (dhcp   from router)
       from RPi)

From the already done setup first rename 08-wlan0.network:

rpi ~$ sudo -Es
rpi ~# mv /etc/systemd/network/08-wlan0.network /etc/systemd/network/16-br0_up.network

and change line Name=wlan0 into Name=br0 in /etc/systemd/network/16-br0_up.network.

Then add these two files:

rpi ~# cat > /etc/systemd/network/02-br0.netdev <<EOF

rpi ~# cat > /etc/systemd/network/04-br0_add-eth0.network <<EOF

Now we have to tell wpa_supplicant for wlan0 to use a bridge. We do it by modifying its service with:

rpi ~# systemctl edit wpa_supplicant@wlan0.service

In the empty editor insert these statements, save them and quit the editor:

ExecStartPre=/sbin/iw dev %i set type __ap
ExecStartPre=/bin/ip link set %i master br0

ExecStart=/sbin/wpa_supplicant -c/etc/wpa_supplicant/wpa_supplicant-%I.conf -Dnl80211,wext -i%I -bbr0

ExecStopPost=-/bin/ip link set %i nomaster
ExecStopPost=-/sbin/iw dev %i set type managed

That's it.

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