6、omings.Oneofthemost prominentis theaddressspaceofIP willbeexhausted and themainroutingtable growingproblemtherefore,IETFIPv6wasdesignedtoreplaceIPv4.Asthenextgeneration InternetProtocol IPV6, comparedtoIPV4hasthefollowing characteristics: simplified head
7、er and extension; big enough address space and hierarchy address architecture; Plug and Play internet working; authentication and encryption on network layer; support on service quality; better support on mobile communication. IPv6will replaceIPv4.Theent