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0e1f616
(Get the code!)
(meh submitted before completing).
So, can you confirm which IP addresses this machine got? and/or whether one of these came from the dynamic range?
That said, this should really only happen in two situations:
1. If this is a VM that boots very fast, where it gets an IP from the dynamic range, but the deployed system ends up with a statically configured IP and by the time it is deployed, the lease has not yet been released.
2. A user manually gets the interface to DHCP even if it already has an interface.
Also, as far as Juju, I do not know how it handles the fact, but it would seem that a safe path would be to do a preference order? For example, always check for 'sticky' IP's and if not fallback to whatever else?