s, I., and Chen, G. Motivations for Carrier-side Stateless IPv4 over IPv6 Migration Solutions. Internet-Draft draft-ietf-softwire-stateless-4v6-motivation-05 Internet Engineering Task Force, November 2012. Work in progress. 43. Mrugalski, T., Troan, O., Bao, C., Dec, W., and Yeh, L. DHCPv6 Options for Mapping of Address and Port. Internet-Draft draft-ietf-softwire-map-dhcp-01, Internet Engineering Task Force, August 2012. Work in progress. 44. Fielding, R., Gettys, J., Mogul, J., Frystyk, H., and Lee, T. B.. Hypertext Transfer Protocol - HTTP/1.1. RFC 2068, Internet Engineering Task Force, January 1997. 45. Klensin, J. Simple Mail Transfer Protocol. RFC 5321, Internet Engineering Task Force, October 2008. 46. Cui, Y., Sun, Q., Boucadair, M., Tsou, T., Lee, Y., and Farrer, I. Lightweight 4over6: An Extension to the DS-Lite Architecture. Internet-Draft draft-cui-softwire-b4-translated-ds-lite-09, Internet Engineering Task Force, October 2012. Work in progress. 47. Farrer, I. and Durand, A. lw4over6 Deterministic Architecture. Internet-Draft draft-farrer-softwire-1w406- deterministic-arch-01, Internet Engineering Task Force, October 2012. Work in progress. 48. Boucadair, M., Levis, P., Bajko, G., Savolainen, T., and Tsou, T. Huawei Port Range Configuration Options for PPP IP Control Protocol (IPCP). RFC 6431, Internet Engineering Task Force, November 2011. IPv6 Transition Mechanisms for 3GPP Networks 49. Boucadair, M., Zheng, T., Deng, X., and Queiroz, J. Behavior of BitTorrent service in PCP-enabled networks with AddressSharing Internet-Draft draft-boucadair-pcp-bittorrent-01 Internet Engineering Task Force, May 2012. Work in progress. 50. Hankins, D. and Mrugalski, T. Dynamic Host Configuration Protocol for IPv6 (DHCPv6) Option for Dual- Stack Lite. RFC 6334, Internet Engineering Task Force, August 2011. 51. 3GPP, IP Multimedia Subsystem (IMS); Stage 2. TS 23.228, 3rd Generation Partnership Project (3GPP), September 2010. 52. Soininen, J. Transition Scenarios for 3GPP Networks. RFC 3574, Internet Engineering Task 