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Public bug reported:
When one network has one ipv4 subnet and one ipv6 subnet(SLAAC/DHCPv6 stateless), if wanting to create a port only includes ipv4 address, there will be redundant ipv6 address(SLAAC/DHCPv6 stateless) created for this port.
PS: if the ipv6 subnet is Default(No options specified) or DHCPv6 stateful this issue does not ever occur.
Scenario:
1) create a network and two subnets: one ipv4 subnet and one ipv6 subnet(SLAAC/DHCPv6 stateless)
~$ openstack network create net-01
~$ openstack subnet create ipv4-subnet --network net-01 --subnet-range 192.0.2.0/24
+-------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Field | Value |
+-------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| allocation_pools | 192.0.2.2-192.0.2.254 |
| cidr | 192.0.2.0/24 |
| created_at | 2019-09-16T07:08:45Z |
| description | |
| dns_nameservers | |
| enable_dhcp | True |
| gateway_ip | 192.0.2.1 |
| host_routes | |
| id | cff452fd-f982-43fd-be1a-201225d30c51 |
| ip_version | 4 |
| ipv6_address_mode | None |
| ipv6_ra_mode | None |
| location | Munch({'project': Munch({'domain_id': None, 'id': u'37a1fc155ecf4fccbedf924e5906510a', 'name': 'a1672_CLCM', 'domain_name': 'Default'}), 'cloud': '', 'region_name': 'regionOne', 'zone': None}) |
| name | ipv4-subnet |
| network_id | ae5a6f43-6485-4218-a7d0-0047882e2811 |
| prefix_length | None |
| project_id | 37a1fc155ecf4fccbedf924e5906510a |
| revision_number | 0 |
| segment_id | None |
| service_types | |
| subnetpool_id | None |
| tags | |
| updated_at | 2019-09-16T07:08:45Z |
+-------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
~$ openstack subnet create ipv6-subnet --network net-01 --ip-version=6 --ipv6-ra-mode=slaac --ipv6-address-mode=slaac --subnet-range 2004::/64
+-------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Field | Value |
+-------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| allocation_pools | 2004::2-2004::ffff:ffff:ffff:ffff |
| cidr | 2004::/64 |
| created_at | 2019-09-16T07:12:19Z |
| description | |
| dns_nameservers | |
| enable_dhcp | True |
| gateway_ip | 2004::1 |
| host_routes | |
| id | b56e5697-75b1-451f-95c4-bc1562d94ac4 |
| ip_version | 6 |
| ipv6_address_mode | slaac |
| ipv6_ra_mode | slaac |
| location | Munch({'project': Munch({'domain_id': None, 'id': u'37a1fc155ecf4fccbedf924e5906510a', 'name': 'a1672_CLCM', 'domain_name': 'Default'}), 'cloud': '', 'region_name': 'regionOne', 'zone': None}) |
| name | ipv6-subnet |
| network_id | ae5a6f43-6485-4218-a7d0-0047882e2811 |
| prefix_length | None |
| project_id | 37a1fc155ecf4fccbedf924e5906510a |
| revision_number | 0 |
| segment_id | None |
| service_types | |
| subnetpool_id | None |
| tags | |
| updated_at | 2019-09-16T07:12:19Z |
+-------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
2) Now let's create a port in this network: only one desired subnet(ipv4-subnet) for this port
~$ openstack port create --network net-01 --fixed-ip subnet=ipv4-subnet port-only-ipv4
+-------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Field | Value |
+-------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| admin_state_up | UP |
| allowed_address_pairs | |
| binding_host_id | None |
| binding_profile | None |
| binding_vif_details | None |
| binding_vif_type | None |
| binding_vnic_type | normal |
| created_at | 2019-09-16T07:13:49Z |
| data_plane_status | None |
| description | |
| device_id | |
| device_owner | |
| dns_assignment | None |
| dns_domain | None |
| dns_name | None |
| extra_dhcp_opts | |
| fixed_ips | ip_address='192.0.2.7', subnet_id='cff452fd-f982-43fd-be1a-201225d30c51' |
| | ip_address='2004::f816:3eff:fe4a:3278', subnet_id='b56e5697-75b1-451f-95c4-bc1562d94ac4' |
| id | 00b2ade7-dcb8-489b-b92b-82b1208aac5f |
| location | Munch({'project': Munch({'domain_id': None, 'id': u'37a1fc155ecf4fccbedf924e5906510a', 'name': 'a1672_CLCM', 'domain_name': 'Default'}), 'cloud': '', 'region_name': 'regionOne', 'zone': None}) |
| mac_address | fa:16:3e:4a:32:78 |
| name | port-only-ipv4 |
| network_id | ae5a6f43-6485-4218-a7d0-0047882e2811 |
| port_security_enabled | True |
| project_id | 37a1fc155ecf4fccbedf924e5906510a |
| propagate_uplink_status | None |
| qos_policy_id | None |
| resource_request | None |
| revision_number | 7 |
| security_group_ids | 40d4ed5f-441f-40e1-8f99-089164271c03 |
| status | DOWN |
| tags | |
| trunk_details | None |
| updated_at | 2019-09-16T07:13:50Z |
+-------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
As we see we get redundant ipv6 address(SLAAC IP) for this port.
Expected is to get ipv4 address only for this port.
** Affects: neutron
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1844097
Title:
Redundant ipv6 address(SLAAC/DHCPv6 stateless) created for port
Status in neutron:
New
Bug description:
When one network has one ipv4 subnet and one ipv6 subnet(SLAAC/DHCPv6 stateless), if wanting to create a port only includes ipv4 address, there will be redundant ipv6 address(SLAAC/DHCPv6 stateless) created for this port.
PS: if the ipv6 subnet is Default(No options specified) or DHCPv6 stateful this issue does not ever occur.
Scenario:
1) create a network and two subnets: one ipv4 subnet and one ipv6 subnet(SLAAC/DHCPv6 stateless)
~$ openstack network create net-01
~$ openstack subnet create ipv4-subnet --network net-01 --subnet-range 192.0.2.0/24
+-------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Field | Value |
+-------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| allocation_pools | 192.0.2.2-192.0.2.254 |
| cidr | 192.0.2.0/24 |
| created_at | 2019-09-16T07:08:45Z |
| description | |
| dns_nameservers | |
| enable_dhcp | True |
| gateway_ip | 192.0.2.1 |
| host_routes | |
| id | cff452fd-f982-43fd-be1a-201225d30c51 |
| ip_version | 4 |
| ipv6_address_mode | None |
| ipv6_ra_mode | None |
| location | Munch({'project': Munch({'domain_id': None, 'id': u'37a1fc155ecf4fccbedf924e5906510a', 'name': 'a1672_CLCM', 'domain_name': 'Default'}), 'cloud': '', 'region_name': 'regionOne', 'zone': None}) |
| name | ipv4-subnet |
| network_id | ae5a6f43-6485-4218-a7d0-0047882e2811 |
| prefix_length | None |
| project_id | 37a1fc155ecf4fccbedf924e5906510a |
| revision_number | 0 |
| segment_id | None |
| service_types | |
| subnetpool_id | None |
| tags | |
| updated_at | 2019-09-16T07:08:45Z |
+-------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
~$ openstack subnet create ipv6-subnet --network net-01 --ip-version=6 --ipv6-ra-mode=slaac --ipv6-address-mode=slaac --subnet-range 2004::/64
+-------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Field | Value |
+-------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| allocation_pools | 2004::2-2004::ffff:ffff:ffff:ffff |
| cidr | 2004::/64 |
| created_at | 2019-09-16T07:12:19Z |
| description | |
| dns_nameservers | |
| enable_dhcp | True |
| gateway_ip | 2004::1 |
| host_routes | |
| id | b56e5697-75b1-451f-95c4-bc1562d94ac4 |
| ip_version | 6 |
| ipv6_address_mode | slaac |
| ipv6_ra_mode | slaac |
| location | Munch({'project': Munch({'domain_id': None, 'id': u'37a1fc155ecf4fccbedf924e5906510a', 'name': 'a1672_CLCM', 'domain_name': 'Default'}), 'cloud': '', 'region_name': 'regionOne', 'zone': None}) |
| name | ipv6-subnet |
| network_id | ae5a6f43-6485-4218-a7d0-0047882e2811 |
| prefix_length | None |
| project_id | 37a1fc155ecf4fccbedf924e5906510a |
| revision_number | 0 |
| segment_id | None |
| service_types | |
| subnetpool_id | None |
| tags | |
| updated_at | 2019-09-16T07:12:19Z |
+-------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
2) Now let's create a port in this network: only one desired subnet(ipv4-subnet) for this port
~$ openstack port create --network net-01 --fixed-ip subnet=ipv4-subnet port-only-ipv4
+-------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Field | Value |
+-------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| admin_state_up | UP |
| allowed_address_pairs | |
| binding_host_id | None |
| binding_profile | None |
| binding_vif_details | None |
| binding_vif_type | None |
| binding_vnic_type | normal |
| created_at | 2019-09-16T07:13:49Z |
| data_plane_status | None |
| description | |
| device_id | |
| device_owner | |
| dns_assignment | None |
| dns_domain | None |
| dns_name | None |
| extra_dhcp_opts | |
| fixed_ips | ip_address='192.0.2.7', subnet_id='cff452fd-f982-43fd-be1a-201225d30c51' |
| | ip_address='2004::f816:3eff:fe4a:3278', subnet_id='b56e5697-75b1-451f-95c4-bc1562d94ac4' |
| id | 00b2ade7-dcb8-489b-b92b-82b1208aac5f |
| location | Munch({'project': Munch({'domain_id': None, 'id': u'37a1fc155ecf4fccbedf924e5906510a', 'name': 'a1672_CLCM', 'domain_name': 'Default'}), 'cloud': '', 'region_name': 'regionOne', 'zone': None}) |
| mac_address | fa:16:3e:4a:32:78 |
| name | port-only-ipv4 |
| network_id | ae5a6f43-6485-4218-a7d0-0047882e2811 |
| port_security_enabled | True |
| project_id | 37a1fc155ecf4fccbedf924e5906510a |
| propagate_uplink_status | None |
| qos_policy_id | None |
| resource_request | None |
| revision_number | 7 |
| security_group_ids | 40d4ed5f-441f-40e1-8f99-089164271c03 |
| status | DOWN |
| tags | |
| trunk_details | None |
| updated_at | 2019-09-16T07:13:50Z |
+-------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
As we see we get redundant ipv6 address(SLAAC IP) for this port.
Expected is to get ipv4 address only for this port.
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