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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