Identical MAC address on RPI4 installs

Installation Home Assistant OS
1

hi,

I installed home assistant OS using balena etcher and today’s version from url which is https://github.com/home-assistant/operating-system/releases/download/9.0/haos_rpi4-64-9.0.img.xz

Issue I face is that this one and my current install on another RPI4 now have the same MAC address on their eth0 and I cannot find where to change it. I read some instruction to change /boot/cmdline.txt and add a line to change it as per option 4 in Change Raspberry Pi MAC address - KaliTut but that did not work.

For now I have the new one on wlan so mac is different and reserving ip address on the router works, but I would prefer to have the wired eth0 working. It did seem to work by assigning a fixed ip in the network section in home assistant settings screen, but I’m afraid duplicate mac will cause trouble sooner rather than later.

Suggestions very much appreciated!
jhh

2

Solution seems to be: install ssh addon and then use following command to get the UUID:

> nmcli connection show
NAME              UUID                                  TYPE      DEVICE
Supervisor eth0   long-uuid-string-eth0                 ethernet  eth0
Supervisor wlan0  long-uuid-string-wlan                 wifi      wlan0

then following command to assign a new MAC:

> nmcli connection modify long-uuid-string-eth0 ethernet.cloned-mac-address new:mac:address

for now the new MAC survives reboot, power loss and getting ip assigned in router is working so that seems to be good.

Environment: Home Assistant 2022.9.6, Supervisor 2022.09.1, Operating System 9.0