Raspberry MAC address changes at each reboot

[Alessio]

Hello.
If I'm not wrong, there was an issue, around Fedora 27 (or it was 28?)
where the MAC address of the wifi card was different upon each reboot.
The issue was solved in some kernel update (or uboot update? sorry, I
don't remember).

Now the issue is here again.
Raspberry Pi 3, Fedora 30, aarch64, kernel 5.1.2-300

Are you aware of that?

Thanks,
A.

[Alessio]

On Mon, 2019-05-20 at 23:20 +0200, Alessio wrote:
> Hello.
> If I'm not wrong, there was an issue, around Fedora 27 (or it was
> 28?)
> where the MAC address of the wifi card was different upon each
> reboot.

Uh, in addition the wlan0 mac address changes over time.
While the Raspberry is up and running, every 5 minutes, the mac address
automatically changes.
What do you think?

[Peter Robinson]

On Tue, May 21, 2019 at 11:35 AM Alessio  wrote:
> On Mon, 2019-05-20 at 23:20 +0200, Alessio wrote:
> > Hello.
> > If I'm not wrong, there was an issue, around Fedora 27 (or it was
> > 28?)
> > where the MAC address of the wifi card was different upon each
> > reboot.
>
> Uh, in addition the wlan0 mac address changes over time.
> While the Raspberry is up and running, every 5 minutes, the mac address
> automatically changes.
> What do you think?

I've not seen this with my usage, what image are you running on it? It
sounds like something has enabled the wlan mac randomisation feature
in NM to ensure privacy.

https://fedoramagazine.org/randomize-mac-address-nm/
https://blogs.gnome.org/thaller/2016/08/26/mac-address-spoofing-in-networkma...

[Alessio]

On Tue, 2019-05-21 at 11:54 +0100, Peter Robinson wrote:
> I've not seen this with my usage, what image are you running on it?

Fedora-Server-30-1.2.aarch64
> https://blogs.gnome.org/thaller/2016/08/26/mac-address-spoofing-in-networkma...

Yes, indeed! I was reading the same blog post. I was not aware that it
was enabled by default. This is the first time I've seen such
behaviour.

So, creating a file like this: /etc/NetworkManager/conf.d/00-
macrandomize.conf

[device]
wifi.scan-rand-mac-address=no

The MAC address will be the same upon each reboot.

Thanks.

[Peter Robinson]

On Tue, May 21, 2019 at 12:01 PM Alessio  wrote:
> On Tue, 2019-05-21 at 11:54 +0100, Peter Robinson wrote:
> > I've not seen this with my usage, what image are you running on it?
>
> Fedora-Server-30-1.2.aarch64
> > https://blogs.gnome.org/thaller/2016/08/26/mac-address-spoofing-in-networkma...
>
> Yes, indeed! I was reading the same blog post. I was not aware that it
> was enabled by default. This is the first time I've seen such
> behaviour.

We use the Fedora defaults, and those defaults are up to the
NetworkManager maintainers, maybe there was a defaults change in
Fedora 30 or in NM 1.16.0

Peter

[Alessio]

On Tue, 2019-05-21 at 12:05 +0100, Peter Robinson wrote:
> We use the Fedora defaults, and those defaults are up to the
> NetworkManager maintainers, maybe there was a defaults change in
> Fedora 30 or in NM 1.16.0

Yes, the same behaviour is on a laptop with F30 Workstation, and also
on F29. I never noticed till right now.

Thank you Peter.

Ciao,
A.