Section: 6.2 IP address allocation 6.2.1 General
Content: The UE can configure an IPv4 address during the establishment of a default EPS bearer context. The UE can obtain an IPv4 address or an IPv6 prefix or both via an IETF-based IP address allocation mechanism once the default bearer is established. The following IETF-based IP address/prefix allocation methods are specified for EPS (the corresponding procedures are specified in 3GPP TS 29.061[ Interworking between the Public Land Mobile Network (PLMN) supporting packet based services and Packet Data Networks (PDN) ]  [16]): a) /64 IPv6 default prefix allocation via IPv6 stateless address autoconfiguration. Optionally, allocation of additional IPv6 prefix(es) with length /64 or shorter via stateful DHCPv6 Prefix Delegation (see IETF RFC 3633 [24A]); b) IPv4 address allocation and IPv4 parameter configuration via DHCPv4; c) IPv6 parameter configuration via stateless DHCPv6. NOTE: From the perspective of the UE, the procedure used to allocate a static IP address via NAS signalling is the same as the procedure used to allocate a dynamic IP address specified in clause 6.2.2. Upon deactivation of the default bearer of a PDN connection, the UE shall locally release any IPv4 address or IPv6 prefix allocated to the UE for the corresponding PDN connection.