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Hi Nobunaga,

The controller won't need more network access (just one for management and access to other nodes), as, your Network node will be in charge of that (3 interfaces, one for management, one for the tunnel with compute nodes, and the last one for external access to your instances):

http://docs.openstack.org/juno/install-guide/install/apt/content/figures/1/a/common/figures/installguidearch-neutron-networks.png

Does it make sense ?