NAT Local and Global 的定义

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1、NAT:LocalandGlobal的定义思科的官方定义如下:·Insidelocaladdress—TheIPaddressassignedtoahostontheinsidenetwork.ThisistheaddressconfiguredasaparameterofthecomputerOSorreceivedviadynamicaddressallocationprotocolssuchasDHCP.TheaddressislikelynotalegitimateIPaddressassignedbytheNetworkInformationCenter(NIC

2、)orserviceprovider.·Insideglobaladdress—AlegitimateIPaddressassignedbytheNICorserviceproviderthatrepresentsoneormoreinsidelocalIPaddressestotheoutsideworld.·Outsidelocaladdress—TheIPaddressofanoutsidehostasitappearstotheinsidenetwork.Notnecessarilyalegitimateaddress,itisallocatedfromanadd

3、ressspaceroutableontheinside.·Outsideglobaladdress—TheIPaddressassignedtoahostontheoutsidenetworkbythehostowner.Theaddressisallocatedfromagloballyroutableaddressornetworkspace.Packetssourcedontheinsideportionofthenetworkhaveaninsidelocaladdressasthesourceaddressandanoutsidelocaladdressast

4、hedestinationaddressofthepacket,whilethepacketresidesontheinsideportionofthenetwork.Whenthatsamepacketgetsswitchedtotheoutsidenetwork,thesourceofthepacketisnowknownastheinsideglobaladdressandthedestinationofthepacketisknownastheoutsideglobaladdress.Conversely,whenapacketissourcedontheouts

5、ideportionofthenetwork,whileitisontheoutsidenetwork,itssourceaddressisknownastheoutsideglobaladdress.Thedestinationofthepacketisknownastheinsideglobaladdress.Whenthesamepacketgetsswitchedtotheinsidenetwork,thesourceaddressisknownastheoutsidelocaladdressandthedestinationofthepacketisknowna

6、stheinsidelocaladdress.Thesesectionsexaminethesetermsmorecloselyandusethistopologyandexamples.Define Inside Local and Inside Global Addresses In this configuration, when the NAT router receives a packet on its inside interface with a source address of 10.10.10.1, the source address is tra

7、nslated to 171.16.68.5. This also means that when the NAT router receives a packet on its outside interface with a destination address of 171.16.68.5, the destination address is translated to 10.10.10.1.ip nat inside source static 10.10.10.1 171.16.68.5 !--- Inside