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On the subject of Prefix Delegation - yes, the external system is
responsible for the routing. Here¹s a couple of video guides on using
PD in Neutron and setting up the Prefix Delegation Server (in this case
a dibbler server):

Using Neutron PD: https://www.youtube.com/watch?v=wI830s881HQ

Configuring the PD server: https://www.youtube.com/watch?v=zfsFyS01Fn0

The patch is up for review at: https://review.openstack.org/#/c/158697

And the networking guide docs: https://review.openstack.org/#/c/178739

John

On 06/05/2015 17:57, "Carl Baldwin" <carl at ecbaldwin.net> wrote:


>On Wed, May 6, 2015 at 12:46 AM, Mike Spreitzer <mspreitz at us.ibm.com>
>wrote:
>> While I am a Neutron operator, I am also a customer of a lower layer
>>network
>> provider.  That network provider will happily give me a few /64.  How
>>do I
>> serve IPv6 subnets to lots of my tenants?  In the bad old v4 days this
>>would
>> be easy: a tenant puts all his stuff on his private networks and NATs
>>(e.g.,
>> floating IP) his edge servers onto a public network --- no need to align
>> tenant private subnets with public subnets.  But with no NAT for v6,
>>there
>> is no public/private distinction --- I can only give out the public v6
>> subnets that I am given.  Yes, NAT is bad.  But not being able to get
>>your
>> job done is worse.
>
>Mike, in this paragraph, you're hitting on something that has been on
>my mind for a while.  We plan to cover this problem in detail in this
>talk [1] and we're defining some work for Liberty to better address it
>[2][3].  You hit the nail on the head, there is no distinguishing
>private and public IP addresses in Neutron currently with IPv6.
>
>Kilo's new subnet pool feature is a start.  It will allow you to
>create a shared subnet pool including the /64s from your service
>provider.  Tenants can then create a subnet getting an allocation from
>it automatically.  However, given the current state of things, there
>will be some manual work on the gateway router to route them to the
>tenant's router.
>
>Prefix delegation -- which looks on track for Liberty -- is another
>option which could fill this void.  It will allow a router to get a
>prefix delegation from an external PD system which will be useable on
>a tenant subnet.  Presumably the external system will take care of
>routing the subnet to the appropriate tenant router.
>
>Carl
>
>[1] http://sched.co/2qdm
>[2] https://review.openstack.org/#/c/180267/
>[3] https://review.openstack.org/#/c/125401/
>
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