https://ask.openstack.org/en/question/53326/dhcp-for-private-networks-stoped-working-after-the-most-recent-update-rdo-juno-two-node-cluster-on-centos-7/

https://ask.openstack.org/en/question/53168/need-help-setting-up-neutron-networking/

https://ask.openstack.org/en/question/53331/rdo-instance-network-issue/

Three users have same symptoms - failure to obtain private IP via DHCP (dnsmasq)

Thanks.
Boris.