A method comprising: receiving, in a network element of a packet data core network, a network resource request from a user equipment, said request including indication on the user equipment's Internet Protocol (IP) version capability; creating, in said network element, a set of parameters for guiding the user equipment in IP address allocation at least in one packet data network, said set of parameters including at least a recommended version of IP address type to be used; and signalling said set of parameters to the user equipment as a response to the network resource request.