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  1. The Layer 3 routers/gateways of the CloudStack POD get a /40 IPv6 subnet routed to them using OSPF/BGP/Static routes. This assigment is static. Outside the control/scope of CloudStack.
  2. In the routers the DHCPv6 Relay is configured which forwards all DHCPv6 requests towards a DHCPv6 server under control of CloudStack
  3. In the Layer 2 network a /64 (POD) IPv6 is configured with Router Advertisements enabled. This /64 is NOT in the /40 routed to the routers. CloudStack has to know which subnet is being used here.
  4. Instances use SLAAC (without Privacy Extensions) to obtain a IPv6 address. They have to use the /64 subnet plus their MAC to generate the address.

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