Open Stack

Hello all,

i manage a small openstack cluster installed via Ubuntu package, it has 
been upgraded since the day of Newton and currently running Victoria. it 
started as a single node with the basic services installed, later a 
dedicated storage node and compute node were added. after upgrading to 
victoria, any instance that boot on the dedicated compute node start up 
but fails to get it's global ipv6 via stateful dhcp6, only 
linklocal(fe80) ip is shown by the instance. The ipv6 is created in 
openstack, the dhcpv4 works and there are no issue if the instance boot 
on the "old" all in one node. i can manually allocate (by editing the 
instance network config file) the ipv6 config and it works. any pointer 
as to what could cause this issue ?

BR, Michael