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Design 1: IPv6 Addressing with DHCPv6 IA_NA and DHCPv6 Prefix Delegation

This design (Figure 1) uses DHCPv6 IA_NA and DHCPv6 prefix delegation in your subscriber access network as follows:

DHCPv6 IA_NA is used to assign a global IPv6 address on the WAN link. The address can come from a local pool or AAA RADIUS.
DHCPv6 prefix delegation is used for host device addressing. The delegated prefix can come from a local pool or from AAA RADIUS. The CPE uses the delegated prefix for subscriber addressing. The CPE can use NDRA or DHCPv6 to allocate IPv6 addresses on the LAN.

Figure 1: Subscriber Access Network with DHCPv6 IA_NA and DHCPv6 Prefix Delegation