[systemd-devel] Should `MACAddressPolicy=persistent` for bridges/bonds/all-software-devices be reconsidered?

[Lennart Poettering]

On Mo, 09.05.22 22:37, Dusty Mabe (dusty at dustymabe.com) wrote:

> > This is true. But one can just as well argument that with
> > MACAddressPolicy=persistent the address is even more predictable. If
> > you know the machine-id and device name, you can calculate the address
> > in advance, even before deciding if the device will e.g. have this or
> > that card attached.
>
> Regarding machine-id, isn't that unique and set on first boot?

Not necessarily. We will initialize it from the ID passed in through
DMI if we detect execution in a VM and the ID is not set yet. This
means cloud providers can control the machine ID a system will use
ahead of time.

Lennart

--
Lennart Poettering, Berlin