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[Maximilian Stinsky <2116927@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Greetings,

When creating a subnet from a subnet pool in Horizon 2024.2, the
"Network Mask" dropdown shows all possible IPv6 prefix lengths (/1 to
/128), despite the selected subnet pool having min_prefixlen,
max_prefixlen, and default_prefixlen all set to /64. Selecting any
prefix length other than /64 results in a permission denied error, as
expected.

In earlier versions of Horizon (e.g. Yoga), only valid prefix lengths within the allowed range were shown in the UI, which was the correct behavior.
Also the default_prefixlen was shown as "(POOL DEFAULT)" next to the prefix in earlier versions which I dont see in horizon 2024.2 anymore.

Subnet pool output which I used for testing:

openstack subnet pool show fe734292-7052-4954-b8ff-f8ebdbfd2b6d
+-------------------+--------------------------------------+
| Field             | Value                                |
+-------------------+--------------------------------------+
| address_scope_id  | 85880696-811e-4621-8128-2b8673a8e5a9 |
| created_at        | 2025-05-09T11:26:43Z                 |
| default_prefixlen | 64                                   |
| default_quota     | None                                 |
| description       |                                      |
| id                | fe734292-7052-4954-b8ff-f8ebdbfd2b6d |
| ip_version        | 6                                    |
| is_default        | True                                 |
| max_prefixlen     | 64                                   |
| min_prefixlen     | 64                                   |
| name              | provider_customer_v6                 |
| prefixes          | 2001:****/48                  |
| project_id        | 5c5858f4a7294f1eb64e50c0cf2470d6     |
| revision_number   | 0                                    |
| shared            | True                                 |
| tags              |                                      |
| updated_at        | 2025-05-09T11:26:43Z                 |
+-------------------+--------------------------------------+

** Affects: horizon
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2116927

Title:
  Horizon shows all prefix lengths when creating subnet from subnet pool

Status in OpenStack Dashboard (Horizon):
  New

Bug description:
  Greetings,

  When creating a subnet from a subnet pool in Horizon 2024.2, the
  "Network Mask" dropdown shows all possible IPv6 prefix lengths (/1 to
  /128), despite the selected subnet pool having min_prefixlen,
  max_prefixlen, and default_prefixlen all set to /64. Selecting any
  prefix length other than /64 results in a permission denied error, as
  expected.

  In earlier versions of Horizon (e.g. Yoga), only valid prefix lengths within the allowed range were shown in the UI, which was the correct behavior.
  Also the default_prefixlen was shown as "(POOL DEFAULT)" next to the prefix in earlier versions which I dont see in horizon 2024.2 anymore.

  Subnet pool output which I used for testing:

  openstack subnet pool show fe734292-7052-4954-b8ff-f8ebdbfd2b6d
  +-------------------+--------------------------------------+
  | Field             | Value                                |
  +-------------------+--------------------------------------+
  | address_scope_id  | 85880696-811e-4621-8128-2b8673a8e5a9 |
  | created_at        | 2025-05-09T11:26:43Z                 |
  | default_prefixlen | 64                                   |
  | default_quota     | None                                 |
  | description       |                                      |
  | id                | fe734292-7052-4954-b8ff-f8ebdbfd2b6d |
  | ip_version        | 6                                    |
  | is_default        | True                                 |
  | max_prefixlen     | 64                                   |
  | min_prefixlen     | 64                                   |
  | name              | provider_customer_v6                 |
  | prefixes          | 2001:****/48                  |
  | project_id        | 5c5858f4a7294f1eb64e50c0cf2470d6     |
  | revision_number   | 0                                    |
  | shared            | True                                 |
  | tags              |                                      |
  | updated_at        | 2025-05-09T11:26:43Z                 |
  +-------------------+--------------------------------------+

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