Comment 9 for bug 1690231

@andresrl, to my knowledge this bug was created as a result of an outage on an unmanaged subnet, and there's nothing in the description which suggests it refers to managed subnets. This leads me to the conclusion that it is the same problem as #1569683.

To me the core issue in both bugs is that MAAS seems to depend on its own configuration to determine which addresses are in use, rather than using the operational state of the network. The latter should be determined through the use of ping and/or the ARP table.