Section: 13.3.1.2 IPv6 Prefix allocation via IPv6 stateless address autoconfiguration via DHCPv6
Content: When the IPv6 prefix is allocated from the external PDN, it is the P-GW’s responsibility to obtain the IPv6 prefix for external PDN, allocate and release the IPv6 prefix. The P-GW may use DHCPv6 to obtain the IPv6 prefix from the external PDN. In this context, the P-GW shall act as a DHCP client as per IETF RFC 3315 [46] towards the external DHCPv6 server. The use cases between the UE and the P-GW that may lead the P-GW to interwork with the external DHCPv6 servers are described in subclause 11.2.1.3.1a.