Section: 6.1.2A.2 IP address allocation via NAS signalling
Content: The MS shall set the PDP type in the PDP address IE in the ACTIVATE PDP CONTEXT REQUEST message when requesting establishment of a default PDP context; the detailed rules with regards to IP version for MS and network side are defined in subclause 6.1.3.1. If the MS wants to use DHCPv4 for IPv4 address assignment, it shall indicate that to the network within the Protocol Configuration Options IE in the ACTIVATE PDP CONTEXT REQUEST. If the MS requests allocation of an IPv6 address, the network constructs it of two parts: a /64 IPv6 prefix and an interface identifier of 64 bits length. The IPv6 prefix part is not used immediately by the MS; however, the network shall use the same IPv6 prefix in subsequent procedures for IETF-based IP address allocation. The interface identifier is only used for building a unique link-local IPv6 address.