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2018-04-14 22:21:11 -0600 asked a question How instance obtain ip from external dhcp server

I choose provider network option on my OpenStack. I have existing external dhcp server. I need my instance obtain ip address from the external dhcp server. However the assigned IP from neutron mismatch with the ip address of instance from the external dhcp server (different ip address). Then the networking of the instance cannot work properly. Additional, I change the ip address of instance to the assigned IP then its networking work properly,