Neutron/OVN + IPv6

Dmitriy Rabotyagov noonedeadpunk at
Wed Jun 22 05:48:44 UTC 2022


As far as I know there's ongoing work to support BGP with OVN. I'm not sure
if it's production ready (bet it's not), but you can totally try it out:

вт, 21 июн. 2022 г., 22:48 Tiago Pires <tiagohp at>:

> Hi Tim,
> From the border routers to the Internet, it is not a problem to summarize
> the /64 in /48 for example.
> My point is how to know the next-hop neutron router's IP that has a subnet
> /64 behind it? When you have many routers, we need a dynamic mechanism for
> it.
> I think the neutron ML2/OVN gap is to not support IPv6 Prefix delegation
> that would be the better solution for it.
> And Neutron BGP dynamic with OVN is not supported as I could check in the
> documentation.
> So, I don't know if there is another way to use IPv6 using the integration
> with Neutron and OVN.
> Regards,
> Tiago Pires
> Em ter., 21 de jun. de 2022 às 15:35, < at>
> escreveu:
>> I think that you’d normally advertise much larger subnets than /64 and
>> then subnet those for different domains. Routing in ipv6 should be much
>> more straightforward as there should be no NAT, which ought to make it much
>> easier to work out what’s talking to what.
>> On 21 Jun 2022, at 18:21, Tiago Pires <tiagohp at> wrote:
>> Hi all,
>> I am trying to figure out how to enable workloads on overlay to use IPv6
>> addresses and communicate with external networks.
>> I have to use Neutron ML2/OVN in my scenario and I have doubts regarding
>> how the external networks(Internet) can know how to reach the VMs using
>> IPv6 address behind a regular neutron router.
>> I was checking this link
>> that uses the BGP speaker on neutron in order to advertise the /64 subnets
>> to a border router, that option should work fine but Neutron/BGP Speaker is
>> not supported with OVN as I could check on the documentation.
>> How are you using IPv6 integration (Neutron/OVN) to advertise the /64
>> subnets?
>> Tiago Pires
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