Description of problem: Neutron does not (yet?) support the mechanism behind simple_ip_management (see e.g. https://bugs.launchpad.net/horizon/+bug/1196541). But it seems Horizon is only checking for support when associating a floating IP, but not when disassociating it. Thus, the behavior is highly inconsistent, if Neutron is used for the Networking and simple_ip_management is on (default). Version-Release number of selected component (if applicable): python-django-horizon-2013.2-0.10b3.el6.noarch How reproducible: Always. Steps to Reproduce: 1. Install OpenStack (e.g. Havana-3) with Neutron 2. Check that HORIZON_CONFIG["simple_ip_management"] is on (default) 3. In Horizon, first associate a floating IP and then disassociate it through the Instances (overview) page. Actual results: Association will show the non-simple behavior ("pick your IP") but Disassociation will show simple behavior ("disassociate and release immediately"). Expected results: Use non-simple in both cases, as long as Neutron doesn't support simple. Additional info: As a workaround, HORIZON_CONFIG["simple_ip_management"] can be set to False in /etc/openstack-dashboard/local_settings
Reported the issue upstream with Horizon.
This bug is being discussed upstream, it's not special to RDO. Upstream tracker is https://bugs.launchpad.net/bugs/1226003