网路地址转换NAT-PAT.ppt

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1、Chapter14ScalingIPAddresseswithNATandPATObjectivesUponcompletionofthischapter,youwillbeabletoperformthefollowingtasks:IdentifyhowNATandPATsolvethelimitedIPaddressproblemanddescribehowtheyoperateConfigureNATandPATVerifyNATandPATChapterActivitiesWindows95PC

2、ModemBranchofficeISDN/analogSmallofficeCentralsiteFrameRelayFrameRelayservicePRIBRIBRIFrameRelayAsyncAAAserverAsyncSA10.1.1.1192.168.2.2SAInsideLocalIPAddress10.1.1.1InsideGlobalIPAddress192.168.2.2NATtablePATWhyUseNAT?UseNATif:YouneedtoconnecttotheInterne

3、tandyourhostsdonothavegloballyuniqueIPaddressesYouchangeovertoanewISPthatrequiresyoutorenumberyournetworkTwointranetswithduplicateaddressesmergeYouwanttosupportbasicloadsharingOutside10.1.1.110.1.1.2InsideInternetNATborderrouterSA192.168.2.2SA10.1.1.1NAT

4、ImplementationConsiderationsAdvantagesConserveslegallyregisteredaddressesReducesaddressoverlapoccurrenceIncreasesflexibilitywhenconnectingtoInternetEliminatesaddressrenumberingasnetworkchangesDisadvantagesTranslationintroducesswitchingpathdelaysLossofend

5、-to-endIPtraceabilityCertainapplicationswillnotfunctionwithNATenabledNATOverviewandTerminologyInternetInside10.1.1.1InsideLocalIPAddress10.1.1.210.1.1.1SimpleNATtableInsideGlobalIPAddress192.168.2.3192.168.2.210.1.1.2HostB172.20.7.3ACBABDSA10.1.1.1DA10.1.1

6、.1SA192.168.2.2DA192.168.2.2NATOperationInsideLocalIPAddress10.1.1.110.1.1.2NATtableInsideGlobalIPAddress192.168.2.2192.168.2.3NATfunctions:TranslationinsidelocaladdressesOverloadinginsideglobaladdressesTCPloaddistributionHandlingoverlappingnetworksInterne

7、tInside10.1.1.110.1.1.2TranslatingInsideLocalAddresses10.1.1.210.1.1.1192.168.2.3192.168.2.2NATtableInsideLocalIPAddressInsideGlobalIPAddress10.1.1.3192.168.2.4InternetInside10.1.1.110.1.1.2HostB172.20.7.313SA10.1.1.1DA10.1.1.1SA192.168.2.2DA192.168.2.210

8、.1.1.210.1.1.3452OverloadingInsideGlobalAddresses10.1.1.2:172310.1.1.1:1024NATtable192.168.2.2:1723192.168.2.2:1024172.21.7.3:23172.20.7.3:23TCPTCP10.1.1.3:1723192.168.2.2:1492172.21.7.3:23TCPInternetInside10