3 John Wiley & Sons, Ltd. Published 2013 by John Wiley & Sons, Ltd. Future of IPv6 in 3GPP Networks access, and Internet Protocol (IP) transmission capabilities. The fast growth of traffic and signaling volumes combined with relatively slower profit growth have forced both operators and equipment vendors to seek for IP traffic offloading solutions. It has been identified that offloading of the bulk Internet traffic (bulk from the 3GPP operators' point of view, not necessarily from the end users' point of view) to alter- native Internet access technologies could be a viable solution to temporarily get away from the investment pressure for more powerful network infrastructure. Quite unsur- prisingly, due to almost ubiquitous support in smart phones and the huge numbers of both private and public access points, the Wireless Local Area Network (WLAN) is visioned to be the technology to which traffic would be offloaded. In the grand scheme of things, the offloading needs to happen from the wide-area radio technologies into local-area radio technologies - hence enabling better spectrum usage and efficiency. It just happens to be that the 3GPP is effectively the main wide-area radio technology, and WLAN is the local-area radio technology, even though the suite of radio technologies is large. To make offloading happen, 3GPP has placed significant effort on standardizing IP traffic offloading solutions for the Evolved Packet Core (EPC). The solutions under stan- dardization include Local IP Access (LIPA) (see Section 4.3.16 of [1]), Selective IP Traffic Offload (SIPTO) enabled bearer (see Section 4.3.15 of [1]), IP Flow Mobility and Seamless WLAN Offload (IFOM) [2], S2a Mobility based on GTP and WLAN access to EPC (SaMOG) [3], and non-seamless WLAN offload. As is traditional in 3GPP, the described solution approaches rely on tight cellular operator control and integration to the 3GPP network architecture. The tight integration comes with typical cons, such as the difficulties of easily interworking with parallel non-3GPP 