Comment 5 for bug 2003121

A couple of related details regarding machine-id induced IP collisions:

The duplicate IP caused by duplicate machine-id will not happen with NetworkManager in Focal and later (NetworkManager versions >1.15) by default due to this change[1]. It is still possible to trigger it by setting `ipv4.dhcp-client-id=duid`.

SystemD is unlikely to follow NetworkManager[2], because doing so would only mask the bigger problem (duplicate machine-id on multiple machines).

Therefore, the duplicate IP symptom is limited to distros using systemd-networkd, however the underlying machine-id issue affects all distros.

[1] https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/commit/cfd696cc3cf43f5f510046b757949546bcee4cdc
[2] https://github.com/systemd/systemd/issues/9609#issuecomment-776277655