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You have to use Flat (or Flat DHCP) networks. Usually you create a Flat shared network on the admin tenant and you use it from the other tenants. If you use VLAN mode it will not work, as you'll need neutron routers to connect them to public networks.

This way traffic goes directly from Instance to OVS and to Network via a bridge mapped to your physical interface. You'll need to configure physical network mappings in the OVS plugin in each hypervisor.

You'll find some information here:

http://docs.openstack.org/trunk/install-guide/install/apt/content/section_neutron-single-flat.html

(You can configure as many flat networks as needed).