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Design 4: IPv6 Addressing with DHCPv6 Prefix Delegation and No NDRA Prefix
In this design (Figure 1), the CPE is a model that is sold by or specified by the service provider. The CPE uses an unnumbered WAN interface. The BNG delegates an IPv6 prefix to the CPE with DHCPv6 prefix delegation. The CPE uses the delegated prefix for subscriber addressing. It can use NDRA or DHCPv6 to allocate the IPv6 addresses on the LAN.
Figure 1: Subscriber Access Network with DHCPv6 Prefix Delegation
