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[Bug 1882873] [NEW] internal server error on updating no-gateway on the dhcpv6 subnet

 

Public bug reported:

nicira@bionic-template:~/devstack$ neutron net-create netbug
neutron CLI is deprecated and will be removed in the future. Use openstack CLI instead.
Created a new network:
+-------------------------+--------------------------------------+
| Field                   | Value                                |
+-------------------------+--------------------------------------+
| admin_state_up          | True                                 |
| availability_zone_hints |                                      |
| availability_zones      | defaultp                             |
| created_at              | 2020-05-27T09:52:16Z                 |
| description             |                                      |
| dns_domain              |                                      |
| id                      | ef1b20da-443c-4032-b148-c594ff7ef5b5 |
| ipv4_address_scope      |                                      |
| ipv6_address_scope      |                                      |
| name                    | netbug                               |
| port_security_enabled   | True                                 |
| project_id              | 77a3f40660c24d20baf65780d5910efc     |
| qos_policy_id           |                                      |
| revision_number         | 2                                    |
| router:external         | False                                |
| shared                  | False                                |
| status                  | ACTIVE                               |
| subnets                 |                                      |
| tags                    |                                      |
| tenant_id               | 77a3f40660c24d20baf65780d5910efc     |
| updated_at              | 2020-05-27T09:52:16Z                 |
+-------------------------+--------------------------------------+
nicira@bionic-template:~/devstack$ neutron subnet-create netbug 29::0/64 --name subnetbug  --ip-version 6
neutron CLI is deprecated and will be removed in the future. Use openstack CLI instead.
Created a new subnet:
+-------------------+------------------------------------------------------+
| Field             | Value                                                |
+-------------------+------------------------------------------------------+
| allocation_pools  | {"start": "29::2", "end": "29::ffff:ffff:ffff:ffff"} |
| cidr              | 29::/64                                              |
| created_at        | 2020-05-27T09:52:52Z                                 |
| description       |                                                      |
| dns_nameservers   |                                                      |
| enable_dhcp       | True                                                 |
| gateway_ip        | 29::1                                                |
| host_routes       |                                                      |
| id                | f37571f1-d142-4281-a60c-404b263dd95d                 |
| ip_version        | 6                                                    |
| ipv6_address_mode |                                                      |
| ipv6_ra_mode      |                                                      |
| name              | subnetbug                                            |
| network_id        | ef1b20da-443c-4032-b148-c594ff7ef5b5                 |
| project_id        | 77a3f40660c24d20baf65780d5910efc                     |
| revision_number   | 0                                                    |
| subnetpool_id     |                                                      |
| tags              |                                                      |
| tenant_id         | 77a3f40660c24d20baf65780d5910efc                     |
| updated_at        | 2020-05-27T09:52:52Z                                 |
+-------------------+------------------------------------------------------+
nicira@bionic-template:~/devstack$ neutron router-create rtrbug
neutron CLI is deprecated and will be removed in the future. Use openstack CLI instead.
Created a new router:
+-------------------------+--------------------------------------+
| Field                   | Value                                |
+-------------------------+--------------------------------------+
| admin_state_up          | True                                 |
| availability_zone_hints |                                      |
| availability_zones      | defaultp                             |
| created_at              | 2020-05-27T09:53:48Z                 |
| description             |                                      |
| external_gateway_info   |                                      |
| id                      | 231c2c3d-ac87-49ca-9034-14379982fb6b |
| name                    | rtrbug                               |
| project_id              | 77a3f40660c24d20baf65780d5910efc     |
| revision_number         | 2                                    |
| routes                  |                                      |
| status                  | ACTIVE                               |
| tags                    |                                      |
| tenant_id               | 77a3f40660c24d20baf65780d5910efc     |
| updated_at              | 2020-05-27T09:53:48Z                 |
+-------------------------+--------------------------------------+
nicira@bionic-template:~/devstack$ neutron router-gateway-set rtrbug public
neutron CLI is deprecated and will be removed in the future. Use openstack CLI instead.
Set gateway for router rtrbug

I tried to update the subnet with no-gateway, which throws internal server error saying backend has no gateway ip 
neutron CLI is deprecated and will be removed in the future. Use openstack CLI instead.
Request Failed: internal server error while processing your request.
Neutron server returns request_ids: ['req-cec527fb-9091-4e05-9d50-40c5ee40757d']

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1882873

Title:
  internal server error on updating no-gateway on the dhcpv6 subnet

Status in neutron:
  New

Bug description:
  nicira@bionic-template:~/devstack$ neutron net-create netbug
  neutron CLI is deprecated and will be removed in the future. Use openstack CLI instead.
  Created a new network:
  +-------------------------+--------------------------------------+
  | Field                   | Value                                |
  +-------------------------+--------------------------------------+
  | admin_state_up          | True                                 |
  | availability_zone_hints |                                      |
  | availability_zones      | defaultp                             |
  | created_at              | 2020-05-27T09:52:16Z                 |
  | description             |                                      |
  | dns_domain              |                                      |
  | id                      | ef1b20da-443c-4032-b148-c594ff7ef5b5 |
  | ipv4_address_scope      |                                      |
  | ipv6_address_scope      |                                      |
  | name                    | netbug                               |
  | port_security_enabled   | True                                 |
  | project_id              | 77a3f40660c24d20baf65780d5910efc     |
  | qos_policy_id           |                                      |
  | revision_number         | 2                                    |
  | router:external         | False                                |
  | shared                  | False                                |
  | status                  | ACTIVE                               |
  | subnets                 |                                      |
  | tags                    |                                      |
  | tenant_id               | 77a3f40660c24d20baf65780d5910efc     |
  | updated_at              | 2020-05-27T09:52:16Z                 |
  +-------------------------+--------------------------------------+
  nicira@bionic-template:~/devstack$ neutron subnet-create netbug 29::0/64 --name subnetbug  --ip-version 6
  neutron CLI is deprecated and will be removed in the future. Use openstack CLI instead.
  Created a new subnet:
  +-------------------+------------------------------------------------------+
  | Field             | Value                                                |
  +-------------------+------------------------------------------------------+
  | allocation_pools  | {"start": "29::2", "end": "29::ffff:ffff:ffff:ffff"} |
  | cidr              | 29::/64                                              |
  | created_at        | 2020-05-27T09:52:52Z                                 |
  | description       |                                                      |
  | dns_nameservers   |                                                      |
  | enable_dhcp       | True                                                 |
  | gateway_ip        | 29::1                                                |
  | host_routes       |                                                      |
  | id                | f37571f1-d142-4281-a60c-404b263dd95d                 |
  | ip_version        | 6                                                    |
  | ipv6_address_mode |                                                      |
  | ipv6_ra_mode      |                                                      |
  | name              | subnetbug                                            |
  | network_id        | ef1b20da-443c-4032-b148-c594ff7ef5b5                 |
  | project_id        | 77a3f40660c24d20baf65780d5910efc                     |
  | revision_number   | 0                                                    |
  | subnetpool_id     |                                                      |
  | tags              |                                                      |
  | tenant_id         | 77a3f40660c24d20baf65780d5910efc                     |
  | updated_at        | 2020-05-27T09:52:52Z                                 |
  +-------------------+------------------------------------------------------+
  nicira@bionic-template:~/devstack$ neutron router-create rtrbug
  neutron CLI is deprecated and will be removed in the future. Use openstack CLI instead.
  Created a new router:
  +-------------------------+--------------------------------------+
  | Field                   | Value                                |
  +-------------------------+--------------------------------------+
  | admin_state_up          | True                                 |
  | availability_zone_hints |                                      |
  | availability_zones      | defaultp                             |
  | created_at              | 2020-05-27T09:53:48Z                 |
  | description             |                                      |
  | external_gateway_info   |                                      |
  | id                      | 231c2c3d-ac87-49ca-9034-14379982fb6b |
  | name                    | rtrbug                               |
  | project_id              | 77a3f40660c24d20baf65780d5910efc     |
  | revision_number         | 2                                    |
  | routes                  |                                      |
  | status                  | ACTIVE                               |
  | tags                    |                                      |
  | tenant_id               | 77a3f40660c24d20baf65780d5910efc     |
  | updated_at              | 2020-05-27T09:53:48Z                 |
  +-------------------------+--------------------------------------+
  nicira@bionic-template:~/devstack$ neutron router-gateway-set rtrbug public
  neutron CLI is deprecated and will be removed in the future. Use openstack CLI instead.
  Set gateway for router rtrbug

  I tried to update the subnet with no-gateway, which throws internal server error saying backend has no gateway ip 
  neutron CLI is deprecated and will be removed in the future. Use openstack CLI instead.
  Request Failed: internal server error while processing your request.
  Neutron server returns request_ids: ['req-cec527fb-9091-4e05-9d50-40c5ee40757d']

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