思科NAT工作原理

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1、Cisco−HowNATWorksCisco−HowNATWorksTableofContentsHowNATWorks.................................................................................................................................................1ThisdocumentcontainsFlashanimation.........................

2、.......................................................................1Introduction...........................................................................................................................................................1BehindtheMask............

3、.......................................................................................................................................2DynamicNATandOverloadingExamples.................................................................................................

4、.........5SecurityandAdministration.................................................................................................................................7Multi−Homing........................................................................................

5、..............................................................9RelatedInformation..............................................................................................................................................9iHowNATWorksThisdocumentcontainsFlashanim

6、ationIntroductionBehindtheMaskDynamicNATandOverloadingExamplesFlashAnimation:DynamicNATSecurityandAdministrationMulti−HomingRelatedInformationIntroductionIfyouarereadingthis,youaremostlikelyconnectedtotheInternetandthere'saverygoodchancethatyouareusingNetworkAddres

7、sTranslation(NAT)rightnow!TheInternethasgrownlargerthananyoneeverimagineditcouldbe.Althoughtheexactsizeisunknown,thecurrentestimateisthatthereareabout100millionhostsandover350millionusersactivelyontheInternet.ThatismorethantheentirepopulationoftheUnitedStates!Infac

8、t,therateofgrowthhasbeensuchthattheInternetiseffectivelydoublinginsizeeachyear.SowhatdoesthesizeoftheInternethavetodowithNAT?Everything!Foracompu