Comment 9 for bug 1533631

It seems there's a deficiency in isc-dhcp client that leads to this. Fedora have been carrying a patch since 2013 that solves it by the simple expedient of scanning the .lease file first for unexpired leases before allocate an address.

See:

http://pkgs.fedoraproject.org/cgit/rpms/dhcp.git/commit/dhcp-honor-expired.patch?h=f24&id=e83fb19c51765442d77fa60596bfdb2b3b9fbe2e

There's no sign that the Fedora devs creating this patch made any attempt to upstream it. I'm going to follow-up with the ISC DHCP devs to find out what their view is.

In the meantime I'm working with the Network Manager devs to develop an acceptable band-aid solution to solve the immediate problem.