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1、英文原文WhatisIPv6?IPv6isshortfor"InternetProtocolVersion6".IPv6isthe"nextgeneration"protocoldesignedbytheIETFtoreplacethecurrentversionInternetProtocol,IPVersion4("IPv4").Mostoftoday'sInternetusesIPv4,whichisnownearlytwentyyearsold.IPv4hasbeenremarkablyresili
2、entinspiteofitsage,butitisbeginningtohaveproblems.Mostimportantly,thereisagrowingshortageofIPv4addresses,whichareneededbyallnewmachinesaddedtotheInternet.IPv6fixesanumberofproblemsinIPv4,suchasthelimitednumberofavailableIPv4addresses.Italsoaddsmanyimprovem
3、entstoIPv4inareassuchasroutingandnetworkautoconfiguration.IPv6isexpectedtograduallyreplaceIPv4,withthetwocoexistingforanumberofyearsduringatransitionperiod.SomeintroductoryinformationabouttheprotocolcanbefoundinourIPv6FAQ.Forthoseinterestedinthetechnicalde
4、tails,wehavealistofIPv6relatedspecifications.InternetProtocolVersion6isabbreviatedtoIPv6(wherethe"6"referstoitbeingassignedversionnumber6).ThepreviousversionoftheInternetProtocolisversion4(referredtoasIPv4).IPv6isanewversionofIPwhichisdesignedtobeanevoluti
5、onarystepfromIPv4.ItisanaturalincrementtoIPv4.ItcanbeinstalledasanormalsoftwareupgradeinInternetdevicesandisinteroperablewiththecurrentIPv4.Itsdeploymentstrategyisdesignedtonothaveanyflagdaysorotherdependencies.IPv6isdesignedtorunwellonhighperformancenetwo
6、rks(e.g.GigabitEthernet,OC-12,ATM,etc.)andatthesametimestillbeefficientforlowbandwidthnetworks(e.g.wireless).Inaddition,itprovidesaplatformfornewInternetfunctionalitythatwillberequiredinthenearfuture.IPv6includesatransitionmechanismwhichisdesignedtoallowus
7、erstoadoptanddeployIPv6inahighlydiffusefashionandtoprovidedirectinteroperabilitybetweenIPv4andIPv6hosts.ThetransitiontoanewversionoftheInternetProtocolmustbeincremental,withfewornocriticalinterdependencies,ifitistosucceed.TheIPv6transitionallowstheuserstou
8、pgradetheirhoststoIPv6,andthenetworkoperatorstodeployIPv6inrouters,withverylittlecoordinationbetweenthetwo.WherecanIgetanIPv6implementationformysystem?Thereissoftwareavailableformostoperatingsystemsincommonus
