Posts: 440
Joined: Wed Sep 25, 2013 8:43 am
Location: Canterbury, Kent, UK
Contact: AOL

Changing MAC address

Fri Oct 11, 2019 12:21 pm


I’ve seen something strange with my Pi 4 and the WLAN MAC address.

I use IP address reservation on my router to provide static addresses to connected devices.

Over the last few days I have been booting from different, fresh installs of Rasbian Lite (2019-09-26) and noticed I could not connect with SSH using the usual IP address for my Pi4, looking at the router I see that the Pi has connected successfully but appears to have a different MAC address from what had been used previously, and hence been allocated a different IP address. Looking through the logs I have at least 4 different MAC addresses for the same Pi…

Has anyone got any idea on what could be causing this ? These are fresh installs, setup headless and updated, that is all ?



The MAC address appears to be changing after every reboot.

Posts: 614
Joined: Sun Dec 30, 2018 8:36 pm
Location: Denmark

Re: Changing MAC address

Fri Oct 11, 2019 3:20 pm

I guess that the mac address is somehow calculated at first boot. But I don't know.
Here is an article on how to spoof the mac address to some specific value: ... -spoofing/

Here is a thread on mac address of Raspberry Pi's: ... p?t=190197


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