5、ecomeanindispensablepartoflife.AsacornerstoneoftheentirenetworkofIPv4hasbeenverymature.However,duetoitsownlimitations,hasbeengraduallyexposedthemanyproblemsandshortcomings.Oneofthemost prominentis theaddressspaceofIP willbeexhausted and themainroutingtable growingpr
6、oblemtherefore,IETFIPv6wasdesignedtoreplaceIPv4.Asthenextgeneration InternetProtocol IPV6, comparedtoIPV4hasthefollowing characteristics: simplified header and extension; big enough address space and hierarchy address architecture; Plug and Play internet working; au
7、thentication and encryption on network layer; support on service quality; better support on mobile communication. IPv6will replaceIPv4.TheentirenetworkfromIPv4transitiontoIPv6needforalongtime,thetwonetworkswillcoexistforalongtimeinthefuture.SoexploretheIPv4andIPv6co
8、nnectivityandtransitiontechnologyhasimportantsignificance.Thispaper introduces thedisadvantagesofIPv4, and themanyadvantagesofIPv6.Analyze