my wish with Proxmox would be:
Have some virtuell Server KVM and OpenVZ and reach them with IPv6
The Proxmox Host (Server) itself dont't need IPv6, he will only be reached in a local Network with a Privat IPv4

the Question was/is how to do it:

ServerProxmox2

So what nedd to be configured on the Proxmox Server?

And what need to be configured on the KVM and the openVZ Server?

 

 Host Proxmox Server Config if needed  
 openVZ Config for IPv6  
 KVM Config for IPv6