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First of all, your network contains an IPv4 and an IPv6 SLAAC subnet.
Given the the definition of SLAAC, your port will receive an IPv6 address
from the Ipv6 subnet. On the other hand, if you want your network to have
both IPv6 and IPv4, and want to selectively assign either IPv4 or IPv6 to
your ports, you shouldn¹t use SLAAC, but DHCP stateful. Hope that this
helps.

‹Robert 

On 7/20/15, 8:01 AM, "Neil Jerram" <Neil.Jerram at metaswitch.com> wrote:

>I am not completely sure, but I believe that the primary associations
>are that:
>
>- a port is attached to a particular network
>
>- a network may have an IPv4 subnet and/or an IPv6 subnet
>
>- therefore, when a port is created, it gets an IPv4 address, and/or an
>IPv6 address, according to the subnets that are associated with the
>network.
>
>Then the question is: what difference does it make if you add
>"--fixed-ip subnet_id=$[ipv4_subnet_id]" to your port creation command?
>
>Unfortunately I don't know the answer to that.  However I do know that
>you can use "neutron port-update --fixed-ip ..." to _add_ an additional
>IP address to an existing port.  Therefore, and also considering your
>observations, I would guess that the effect of "--fixed_ip ..." is
>always strictly additional to the basic IP address allocation behaviour
>that you get based on the network and subnet associations.
>
>Hope that may help...
>
>     Neil
>
>
>On 20/07/15 04:26, zhaobo wrote:
>> Hi ,
>> Could anyone please check the bug below?
>> https://bugs.launchpad.net/neutron/+bug/1467791
>>
>> This bug description:
>> When the created network contains one ipv4 subnet and an ipv6 subnet
>> which turned on slaac or stateless.
>> When I create a port use cmd like:
>> neutron port-create --fixed-ip subnet_id=$[ipv4_subnet_id]
>> $[network_id/name]
>> The specified fixed-ip is ipv4_subnet, but the returned port contained
>> the ipv6 subnet.
>>
>>
>> If user just want a port with ipv4 , why returned port had allocated
>> an ipv6 address.
>> And I know this is an design behavior from
>> 
>>http://specs.openstack.org/openstack/neutron-specs/specs/kilo/multiple-ip
>>v6-prefixes.html#proposed-change
>> But we are still confused about this operation.
>>
>> Thank you anyone could help for confirm this issue , and wish you
>> return the message asap.
>>
>> ZhaoBo
>>
>>
>>
>>
>> 
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