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Why my instances get two IP addresses from DHCP?

My VMs got two IP addresses from the DHCP! why?

root@controller:/# openstack server list
+------------------------------------+------+--------+-------------------------------------+------------+
| ID                                 | Name | Status | Networks                            | Image Name |
+------------------------------------+------+--------+-------------------------------------+------------+
| 7f6b3a3e-4799-4e77-8794-d795531c8c | vm1  | ACTIVE | provider=172.16.0.106, 172.16.0.107 | cirros     |
| 9c                                 |      |        |                                     |            |
| d64f8523-61aa-                     | vm4  | ACTIVE | provider=172.16.0.111, 172.16.0.109 | cirros     |
| 4a92-8817-c9520ce8214c             |      |        |                                     |            |
| 0fc86d17-77b2-4950-a938-d231435fa4 | vm3  | ACTIVE | provider=172.16.0.105, 172.16.0.102 | cirros     |
| df                                 |      |        |                                     |            |
| 32d3a790-c7d0-4930-b943-f85dd06f05 | vm2  | ACTIVE | provider=172.16.0.110, 172.16.0.108 | cirros     |
| a0                                 |      |        |                                     |            |
+------------------------------------+------+--------+-------------------------------------+------------+
root@controller:/#