How to set up wifi station mode and access point mode simultaneously and keep ZeroConf

Question

I have a raspberry pi zero with raspbian buster OS. I followed this tutorial to set up station mode and access point mode simultaneously, and it works.

Question is now I cannot visit my rpi zero with ssh [email protected] , I'll have to type in it's IP address like ssh [email protected].

In the above link, at the "first step" it mentioned another link that removes avahi-daemon, I think that's why bonjour-zeroconf feature is disabled, because it needs avahi-daemon.

So How can I have wifi station mode and access point and also keep zeroconf, so that I can visit my rpi with XXX.local?

Answer 1

We use systemd-networkd which has its own multicast DNS system. That is the reason why we deinstall the avahi-daemon to avoid conflicts.

It is simple to enable multicast DNS with adding an option to the /etc/systemd/network/*.network configuration files. I have revised the setup for an Access point as WiFi router/repeater, optional with bridge that you used. Have a look at the *.network configuration files. On some you will find additional options:

LLMNR=no
MulticastDNS=yes

Add these also to your setup and you should find raspberrypi.local again. Check with:

laptop ~$ resolvectl query raspberrypi.local
raspberrypi.local: 192.168.50.26               -- link: wlan0

-- Information acquired via protocol mDNS/IPv4 in 269.0ms.
-- Data is authenticated: no