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I'am searching for this term too and I found the text as a note here:

http://docs.openstack.org/icehouse/install-guide/install/yum/content/neutron_initial-networks-verify.html

Note If you are building your OpenStack nodes as virtual machines, you must configure the hypervisor to permit promiscuous mode on the external network.

Why do I need this ? I would like not to set the "promiscuous mode" because of security reasons.

Maybe someone can help me ?

TIA