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The supported method to get a new one each boot is to truncate the file to 0 bytes and disable systemd-machine-id-commit.service

Double-check that this method actually works though.

Machine ID is used for things like dhcp leases, log rotation, etc. IPV6 addresses or transient MAC addresses are derived from it



I thought the kernel generated SLAAC addresses based on MAC and privacy addresses based on random numbers.


It does, but DHCPv6 prescribes a persistent device identifier (DUID): https://www.rfc-editor.org/info/rfc9915/#RFC3315-9

The DUID is designed to be unique across all DHCP clients and servers, and stable for any specific client or server. That is, the DUID used by a client or server SHOULD NOT change over time if at all possible; for example, a device's DUID should not change as a result of a change in the device's network hardware or changes to virtual interfaces




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