external network can be plugged also as internal network.
This should be avoided.
Cidr overlapping check also looks not working for this request.
ubuntu:ubuntu% quantum net-list [~/devstack]
+--------------------------------------+---------+--------------------------------------+
| id | name | subnets |+--------------------------------------+---------+--------------------------------------+
| 2824d2ea-7a1c-4165-b5f0-af064612b241 | ext_net | 1b2355e4-5944-43a1-95d1-4c493035e625 |
| fe34aff0-65d2-4375-b3ba-0d716d14d2f7 | net1 | 2c821631-2602-44fb-833a-3efb2cbd5726 |
+--------------------------------------+---------+--------------------------------------+
ubuntu:ubuntu% quantum subnet-list [~/devstack]
+--------------------------------------+------+-----------------+----------------------------------------------------+
| id | name | cidr | allocation_pools |
+--------------------------------------+------+-----------------+----------------------------------------------------+
| 1b2355e4-5944-43a1-95d1-4c493035e625 | | 172.24.4.224/28 | {"start": "172.24.4.226", "end": "172.24.4.238"} |
| 2c821631-2602-44fb-833a-3efb2cbd5726 | | 192.168.57.0/24 | {"start": "192.168.57.2", "end": "192.168.57.254"} |
+--------------------------------------+------+-----------------+----------------------------------------------------+
ubuntu:ubuntu% quantum router-list [~/devstack]
+--------------------------------------+---------+--------------------------------------------------------+
| id | name | external_gateway_info |
+--------------------------------------+---------+--------------------------------------------------------+
| 4e5c3664-1624-4b6b-91e3-ecd71af3360c | router1 | {"network_id": "2824d2ea-7a1c-4165-b5f0-af064612b241"} |
+--------------------------------------+---------+--------------------------------------------------------+
ubuntu:ubuntu% quantum router-interface-add 4e5c3664-1624-4b6b-91e3-ecd71af3360c 1b2355e4-5944-43a1-95d1-4c493035e625 [~/devstack]
Added interface to router 4e5c3664-1624-4b6b-91e3-ecd71af3360c <--- This request should be avoided.
ubuntu:ubuntu% quantum port-list [~/devstack]
+--------------------------------------+------+-------------------+-------------------------------------------------------------------------------------+
| id | name | mac_address | fixed_ips |
+--------------------------------------+------+-------------------+-------------------------------------------------------------------------------------+
| 420f42b8-a21a-498d-b10f-4cd2f996d0d9 | | fa:16:3e:61:74:f3 | {"subnet_id": "2c821631-2602-44fb-833a-3efb2cbd5726", "ip_address": "192.168.57.1"} |
| 4a2a2d2b-6dfb-48dd-89bf-25dd8a915eab | | fa:16:3e:d6:21:ba | {"subnet_id": "1b2355e4-5944-43a1-95d1-4c493035e625", "ip_address": "172.24.4.226"} |
| 4ebd1ca9-fa1e-4a85-bd67-be261004dc89 | | fa:16:3e:1b:8f:92 | {"subnet_id": "1b2355e4-5944-43a1-95d1-4c493035e625", "ip_address": "172.24.4.225"} |
| ec352b72-0479-4b5c-8ee8-6a585f3acb6d | | fa:16:3e:58:58:8d | {"subnet_id": "2c821631-2602-44fb-833a-3efb2cbd5726", "ip_address": "192.168.57.2"} |
+--------------------------------------+------+-------------------+-------------------------------------------------------------------------------------+
was this done either as the admin user, or with an external network where shared=True ? If so, that is actually valid and intentional. Essentially, if shared=True (or if you're an admin user), the external network can also be used as a "standard network".
The suggestion for creating external networks that should function only as external network is to use the default settings of shared=False. Of course, in general an admin user can do whatever they want, including hooking up directly to the network.