I have successfully configured 3 node open stack set up. I could successfully launch instance. But there are problems in networking. The IP assigned to instance is not up. I have re checked my configurations. When I checked ext-net

neutron net-show 4fg13adf-5e0a-4e97-827f-f68a6b641345

+---------------------------+--------------------------------------+
| Field                     | Value                                |
+---------------------------+--------------------------------------+
| admin_state_up            | True                                 |
| id                        | 42ec3adf-5e0a-4e97-827f-f68a6b614260 |
| name                      | ext-net                              |
| provider:network_type     | local                                |
| provider:physical_network |                                      |
| provider:segmentation_id  |                                      |
| router:external           | True                                 |
| shared                    | True                                 |
| status                    | ACTIVE                               |
| subnets                   | 4a361eb9-4b4d-4ece-b253-b7c3f5540c6c |
| tenant_id                 | 65e095d1e8eb413082efa7e5df2abcec     |
+---------------------------+--------------------------------------+

I figured out that provider:network_type is local. But I think it should be gre. How can I change that? I have checked all configs. It is showing type_drivers = gre, tenant_network_types = gre. Please advice.