MAC Address generation on Orange PI Zero

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I have 3 Orange Pi Zero running with the same sd image.

It's all working fine, but yesterday I added a fourth device, which for some reason took a MAC address that is the same of another device, causing issues on the connection for both of them.


I'm using the mainline kernel  ARMBIAN 5.38 stable Debian GNU/Linux 9 (stretch) 4.14.18-sunxi.


Searching on the internet, I found someone saying that mac addresses for Orange Pis are randomly generated every time the device reboots, but in my case the taken MAC address is always the same for every device. I saw to that people suggested to check the content of the /etc/modprobe.d/8189fs.conf file, but I don't have it.


Do you encountered the same problem? How is the mac address generated on the Orange Pi Zero?


Thank you in advance for your cooperation.

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