IPv4和IPv6及其过渡(国外英文资料).doc

IPv4和IPv6及其过渡(国外英文资料) The existing Internet is based on IPv4, which has been around for nearly 30 years. Due to the rapid development of the Internet, the average annual size of the Internet is doubled. The limitations of IPv4 are becoming more apparent. PC market expanded dramatically, and personal mobile computing devices, the increase of the Internet, online entertainment services, multimedia data stream to join, and the demand for security, etc, are pressing for the emergence of a new generation of IP protocol. Therefore, the research and practice of the new Generation of Internet Protocol Next Generation -ipng has become a global hotspot, and its relevant work has been developed. Around IPng basic design objectives, based on the established global test system, the security, mobility, the basic principle of the service quality, the exploration of theory and technology has begun. In the early 1990s, people began to talk about new Internet protocols. IPng IETF working group in September 1994, put forward a formal draft The Recommendation for The IP Next Generation Protocol, The Protocol specification of IPng is determined by The end of 1995, and is called IP version 6 (IPv6), with The version 4 of The now use difference; A major change was made in 1998. IPv6 on the basis of IPv4 was improved, its an important design goal is compatible with IPv4, because evolution may not require all nodes will immediately to the new protocol version, if there is no a transition plan, advanced agreement again also does not have practical significance. IPv6 is for high-performance network networks (such as ATM), and it can also work effectively on low-bandwidth networks such as wireless. Internationally, the research and implementation of IPv6 has begun. Research institutes such as INRIA, KAME, NRL, and other companies such as IBM, Sun Microsystems, Trumpet, Hitachi, etc., have developed IPv6 software and applications on different platforms. Routers such as Cisco and Bay have devel