5、ent,hasbecomeanindispensablepartoflife.AsacornerstoneoftheentirenetworkofIPv4hasbeenverymature.However,duetoitsownlimitations,hasbeengraduallyexposedthemanyproblemsandshortcomings.Oneofthemost prominentis theaddressspaceofIP willbeexhausted and themainroutingtable
6、 growingproblemtherefore,IETFIPv6wasdesignedtoreplaceIPv4.Asthenextgeneration InternetProtocol IPV6, comparedtoIPV4hasthefollowing characteristics: simplified header and extension; big enough address space and hierarchy address architecture; Plug and Play internet
7、 working; authentication and encryption on network layer; support on service quality; better support on mobile communication. IPv6will replaceIPv4.TheentirenetworkfromIPv4transitiontoIPv6needforalongtime,thetwonetworkswillcoexistforalongtimeinthefuture.Soexploreth
8、eIPv4andIPv6connectivityandtransitiontechnologyhasimportantsignificance.Thispaper introduces thedisadvantagesofIPv4, and themanyadvantagesofIPv6.Analyze