IPv6有几个地址可用?给每个沙子够用吗?
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IPv6有几个地址可用?给每个沙子够用吗?
首先,目前全球分配总共有多少,先从IANA了解.
截止现在表格是这样的,其中真正可用就是五大机构的,非五大机构暂时不讨论.
前缀注册机构日期状态2002:0000::/166to42001/2/1分配2001:4200::/23AFRINIC2004/6/1分配2c00:0000::/12AFRINIC2006/10/3分配2001:0200::/23APNIC1999/7/1分配2001:0c00::/23APNIC2002/5/2分配2001:0e00::/23APNIC2003/1/1分配2001:4400::/23APNIC2004/6/11分配2001:8000::/19APNIC2004/11/30分配2001:a000::/20APNIC2004/11/30分配2001:b000::/20APNIC2006/3/8分配2400:0000::/12APNIC2006/10/3分配2001:0400::/23ARIN1999/7/1分配2001:1800::/23ARIN2003/4/1分配2001:4800::/23ARIN2004/8/24分配2600:0000::/12ARIN2006/10/3分配2610:0000::/23ARIN2005/11/17分配2620:0000::/23ARIN2006/9/12分配2630:0000::/12ARIN2019/11/6分配2001:0000::/23IANA1999/7/1分配2d00:0000::/8IANA1999/7/1保留2e00:0000::/7IANA1999/7/1保留3000:0000::/4IANA1999/7/1保留3ffe::/16IANAApr-08保留5f00::/8IANAApr-08保留2001:1200::/23LACNIC2002/11/1分配2800:0000::/12LACNIC2006/10/3分配2001:0600::/23RIPE NCC1999/7/1分配2001:0800::/22RIPE NCC2002/11/2分配2001:1400::/22RIPE NCC2003/7/1分配2001:1a00::/23RIPE NCC2004/1/1分配2001:1c00::/22RIPE NCC2004/5/4分配2001:2000::/19RIPE NCC2019/3/12分配2001:4000::/23RIPE NCC2004/6/11分配2001:4600::/23RIPE NCC2004/8/17分配2001:4a00::/23RIPE NCC2004/10/15分配2001:4c00::/23RIPE NCC2004/12/17分配2001:5000::/20RIPE NCC2004/9/10分配2003:0000::/18RIPE NCC2005/1/12分配2a00:0000::/12RIPE NCC2006/10/3分配2a10:0000::/12RIPE NCC2019/6/5分配
总结起来是这样的.
注册机构实际分配/48数量/64数量/128数量AFRINIC/23+/1268753031168450579865062604883117314555764545397335835770093568APNIC/21+/18+/1269927436288458276446457036884537083228020162327012143360114688ARIN/23+/22+/111375396167689013796324507648166275193930736394135519566042759168LANIC/23+/1268753031168450579865062604883117314555764545397335835770093568RIPE NCC/21+/17+/111397206548489156732836118528168911907179211111290632708709941248
看着眼花了吗?这个数字反正我不会数,总量是585958813449496758547836089653002240个/128,地球沙子总量大概1.67×10^23,大概可以每个沙子编3508735409877.226个地址,眼看可以给沙子编个/87子网(2199023255552个IP地址)也是完全没问题的.
而且所有IPv6都启用的话,就是IANA全分配,没保留的话,大概有42535295865117307932921825928971026432个/128(全球单播地址都在2000::/3中)可用,现在只是启用了1.3775825500488281%,只大致相当于IANA拿了个/9出来分,以后要是谁跟我吹XXX运营商有/8的IPv6就啪啪啪打脸了.
地壳主要由岩石构成,其中沙子的含量是很少的,为了方便计算,我们姑且将其计为千分之一吧。 那么地球上沙子的总质量就约为2.505 x 10^19kg,用这个数字再除以地球上沙粒的平均质量0.00015kg,于是我们得出地球上沙子总数量为1.67 x 10^23粒。
来自谷歌搜索
那么是不是这样每个IPv6的IP数量都多到数不胜数,不是的,首先子网的第一个地址不推荐用,他是子网任播(除非子网是/127和/128),如果子网下所有机器都没开IP包转发这没事,一旦开了就容易出问题,所以不推荐使用.
子网分割大小/48地址数量/64地址数量/128地址数量(不包含任播)0281474976710656184467440737095516163402823669209384634633746074317682114551140737488355328922337203685477580817014118346046923173168730371588410572727036874417766446116860184273879048507059173023461586584365185794205286333518437208883223058430092136939524253529586511730793292182592897102643141759218604441611529215046068469762126764793255865396646091296448551321558796093022208576460752303423488106338239662793269832304564822427566076439804651110428823037615171174453169119831396634916152282411213783037219902325555214411518807585587226584559915698317458076141205606891518109951162777672057594037927936132922799578491587290380706028034457595497558138883602879701896396866461399789245793645190353014017228710274877906944180143985094819843323069989462289682259517650700861431113743895347290071992547409921661534994731144841129758825350430711268719476736450359962737049683076749736557242056487941267521535133435973836822517998136852484153837486827862102824397063376076714171798691841125899906842624207691874341393105141219853168803831585899345925629499534213121038459371706965525706099265844019116429496729628147497671065651922968585348276285304963292200951721474836481407374883553282596148429267413814265248164610047181073741824703687441776641298074214633706907132624082305023195368709123518437208883264903710731685345356631204115251120268435456175921860444163245185536584267267831560205762552113421772887960930222081622592768292133633915780102881272267108864439804651110481129638414606681695789005144063233355443221990232555524056481920730334084789450257203124167772161099511627776202824096036516704239472512860152583886085497558138881014120480182583521197362564300726419430427487790694450706024009129176059868128215032720971521374389534722535301200456458802993406410751281048576687194767361267650600228229401496703205375295242883435973836863382530011411470074835160268730262144171798691843169126500570573503741758013433113107285899345921584563250285286751870879006713265536429496729679228162514264337593543950335333276821474836483961408125713216879677197516734163841073741824198070406285660843983859875833581925368709129903520314283042199192993791364096268435456495176015714152109959649689537204813421772824758800785707605497982484473810246710886412379400392853802748991242233951233554432618970019642690137449562111402561677721630948500982134506872478105541128838860815474250491067253436239052742644194304773712524553362671811952634332209715238685626227668133590597631441610485761934281311383406679529881545852428896714065569170333976494074642621444835703278458516698824703472131072241785163922925834941235148165536120892581961462917470617549327686044629098073145873530875016384302231454903657293676543518192151115727451828646838271524096755578637259143234191355320483777893186295716170956754102418889465931478580854783555129444732965739290427391562564722366482869645213695571282361183241434822606847586411805916207174113034235932590295810358705651711601629514790517935282585561814757395258967641292762473786976294838206463632368934881474191032316411844674407370955161565922337203685477580766461168601842738790367230584300921369395168115292150460684697569576460752303423487702882303761517117437114411518807585587172720575940379279357336028797018963967741801439850948198375900719925474099176450359962737049577225179981368524778112589990684262379562949953421311802814749767106558114073748835532782703687441776638335184372088831841759218604441585879609302220786439804651110387219902325555188109951162777589549755813887902748779069439113743895347192687194767359334359738367941717986918395858993459196429496729597214748364798107374182399536870911100268435455101134217727102671088631033355443110416777215105838860710641943031072097151108104857510952428711026214311113107111265535113327671141638311581911164095117204711810231195111202551211271226312331124151257126312721281
/48是BGP的最小子网,然后包含65536个/64,然后每个/64包含18446744073709551616个/128地址(包含任播),足够任何场合使用,当然依然建议只需要1个IP的场合用/127的点对点分配或者/128的单地址分配,不推荐用DHCPv6,因为没法下发整个子网,而且Next Hop反正也要SLAAC分配.
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