Section: 5.3.1.2.3 IPv6 parameter configuration via stateless DHCPv6
Content: The UE may use stateless DHCPv6 for additional parameter configuration. The PDN GW acts as the DHCP server. When PLMN based parameter configuration is used, the PDN GW provides the requested parameters from locally provisioned database. When external PDN based parameter configuration is used, the PDN GW obtains the requested configuration parameters from the external PDN as described in the previous clauses. When the PDN GW acts as a DHCPv6 server towards the UE, the PDN GW may act as DHCPv6 client towards the external PDN to request the configuration parameters for the UE. If RADIUS or Diameter is used towards the external PDN as described in TS 29.061[ Interworking between the Public Land Mobile Network (PLMN) supporting packet based services and Packet Data Networks (PDN) ]  [38], the requested configuration parameters can be fetched as part of these procedures.