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Message #50246
[Bug 1578281] Re: IPv6 IP allocated on port-create for IPv4 subnet
This is the intended behavior
http://specs.openstack.org/openstack/neutron-specs/specs/kilo/multiple-
ipv6-prefixes.html
** Changed in: neutron
Status: In Progress => Opinion
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https://bugs.launchpad.net/bugs/1578281
Title:
IPv6 IP allocated on port-create for IPv4 subnet
Status in neutron:
Opinion
Bug description:
* High level description: When you have a network that has both IPv4
subnet and a IPv6 stateless subnet, a neutron port-create in which
only a IPv4 subnet is requested (via fixed_ip) results in both IPv4
and IPv6 addresses being allocated for the port. An IPv6 address
should not be allocated in this case.
* Pre-conditions: None. CLI commands executed as tenant user.
* Step-by-step reproduction steps: CLI commands shown below
* Expected output: When creating neutron port with fixed_ip of IPv4
subnet, expected the resulting port to contain only an IPv4 address.
* Actual output: IPv6 and IPv4 addresses were allocated on the port-
create
* Version: master / DevStack
* Steps to re-create:
Create a neutron network with 2 subnets (v4 and v6-slaac)
$ neutron net-create network
$ neutron subnet-create --name subnet_v4 --ip-version 4 network 172.16.1.0/24
$ neutron subnet-create --name subnet_v6 --ip-version 6 --ipv6-ra-mode slaac --ipv6-address-mode slaac network 2001:db8::/64
$ neutron net-list
+--------------------------------------+---------+-----------------------------------------------------+
| id | name | subnets |
+--------------------------------------+---------+-----------------------------------------------------+
| e0c605e7-f117-4319-8eab-6429c8d53b4b | network | bba5da3a-500c-466b-9d1d-f917d5c24d64 172.16.1.0/24 |
| | | 49d0ce59-6888-4e0c-8aff-7def31087524 2001:db8::/64 |
|+--------------------------------------+---------+-----------------------------------------------------+
When creating a neutron port, an IP address is allocated out of both subnets (as expected).
$ neutron port-create network
Created a new port:
+-----------------------+------------------------------------------------------------------------------------------------------+
| Field | Value |
+-----------------------+------------------------------------------------------------------------------------------------------+
| admin_state_up | True |
| allowed_address_pairs | |
| binding:vnic_type | normal |
| created_at | 2016-05-04T15:33:08 |
| description | |
| device_id | |
| device_owner | |
| dns_name | |
| extra_dhcp_opts | |
| fixed_ips | {"subnet_id": "bba5da3a-500c-466b-9d1d-f917d5c24d64", "ip_address": "172.16.1.3"} |
| | {"subnet_id": "49d0ce59-6888-4e0c-8aff-7def31087524", "ip_address": "2001:db8::f816:3eff:feb6:75cc"} |
| id | 0e631b7c-0a1d-4d90-a2d6-23f006d7a345 |
| mac_address | fa:16:3e:b6:75:cc |
| name | |
| network_id | e0c605e7-f117-4319-8eab-6429c8d53b4b |
| port_security_enabled | True |
| security_groups | b886de86-0fdf-4dff-8f07-e67fb7a9a1aa |
| status | DOWN |
| tenant_id | ec507c583aa64f1ca186bc5d7944895e |
| updated_at | 2016-05-04T15:33:08 |
+-----------------------+------------------------------------------------------------------------------------------------------+
When creating a neutron port and requesting just an IPv6 address, the port is allocated with just an IPv6 address (as expected).
$ neutron port-create --fixed-ip subnet_id=49d0ce59-6888-4e0c-8aff-7def31087524 network
Created a new port:
+-----------------------+------------------------------------------------------------------------------------------------------+
| Field | Value |
+-----------------------+------------------------------------------------------------------------------------------------------+
| admin_state_up | True |
| allowed_address_pairs | |
| binding:vnic_type | normal |
| created_at | 2016-05-04T15:34:22 |
| description | |
| device_id | |
| device_owner | |
| dns_name | |
| extra_dhcp_opts | |
| fixed_ips | {"subnet_id": "49d0ce59-6888-4e0c-8aff-7def31087524", "ip_address": "2001:db8::f816:3eff:fe90:e030"} |
| id | 1a3984a0-d0d5-4fc5-af60-e852c81c3ce7 |
| mac_address | fa:16:3e:90:e0:30 |
| name | |
| network_id | e0c605e7-f117-4319-8eab-6429c8d53b4b |
| port_security_enabled | True |
| security_groups | b886de86-0fdf-4dff-8f07-e67fb7a9a1aa |
| status | DOWN |
| tenant_id | ec507c583aa64f1ca186bc5d7944895e |
| updated_at | 2016-05-04T15:34:22 |
+-----------------------+------------------------------------------------------------------------------------------------------+
When creating a neutron port and requesting just an IPv4 address, the port is allocated with an IP address from both subnets.
$ neutron port-create --fixed-ip subnet_id=bba5da3a-500c-466b-9d1d-f917d5c24d64 network
Created a new port:
+-----------------------+------------------------------------------------------------------------------------------------------+
| Field | Value |
+-----------------------+------------------------------------------------------------------------------------------------------+
| admin_state_up | True |
| allowed_address_pairs | |
| binding:vnic_type | normal |
| created_at | 2016-05-04T15:40:29 |
| description | |
| device_id | |
| device_owner | |
| dns_name | |
| extra_dhcp_opts | |
| fixed_ips | {"subnet_id": "bba5da3a-500c-466b-9d1d-f917d5c24d64", "ip_address": "172.16.1.4"} |
| | {"subnet_id": "49d0ce59-6888-4e0c-8aff-7def31087524", "ip_address": "2001:db8::f816:3eff:fe56:fc6e"} |
| id | fb3e6820-0448-47c0-b028-4659a6f6c833 |
| mac_address | fa:16:3e:56:fc:6e |
| name | |
| network_id | e0c605e7-f117-4319-8eab-6429c8d53b4b |
| port_security_enabled | True |
| security_groups | b886de86-0fdf-4dff-8f07-e67fb7a9a1aa |
| status | DOWN |
| tenant_id | ec507c583aa64f1ca186bc5d7944895e |
| updated_at | 2016-05-04T15:40:29 |
+-----------------------+------------------------------------------------------------------------------------------------------+
If the user requested only the IPv4 subnet, an IPv6 address should not
be allocated.
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References
