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IPv6 with Global Scope not getting assigned when VM Boots up

Hi Team,

We are configuring IPv6 Networks on OpenStack Mitaka IPv4 Network, but we are facing the issue that VM after boot up has no IPv6 assigned on the Ethernet port.

We have configured the Networks and configuration following the link

https://docs.openstack.org/mitaka/networking-guide/config-ipv6.html

Dibbler server is also being configured for DHCPv6.

Also enabled the flag in /etc/nova/nova.conf

                     use_ipv6=true

We are able to access the VM via IPv6, by manually assigning the IPv6 by accessing the console using the command

                      ip -6 addr add <IPV6> dev <Interface>

Can you please suggest some steps in order to resolve the concerns.

Regards Anirudh Gupta