15-Configuring Internet Access for a Network (配置in

ConfiguringInternetAccessforaNetworkOverviewOptionsforConnectingaNetworktotheInternetConfiguringInternetAccessbyUsingaRouterConfiguringInternetAccessbyUsingNATOptionsforConnectingaNetworktotheInternetConnectingtotheInternetbyUsingaRouterSecuringInternetConnectionsbyUsingaFirewallConnectingtotheInternetbyUsingNATConnectingtotheInternetbyUsingInternetConnectionSharingConnectingtotheInternetbyUsingaProxyServerComparingInternetConnectivityOptionsConnectingtotheInternetbyUsingaRouterConnectingYourNetworktotheInternetbyUsingaRouter:OptimizesnetworkperformanceEnablesallusersinyournetworktoshareasingleconnectiontotheInternetIstheeasiestmethodforconnectingyournetworktotheInternetRouterInternetIntranetSecuringInternetConnectionsbyUsingaFirewallSecuringInternetConnectionsbyUsingaFirewall:PreventsunauthorizedaccesstoyournetworkEnablesyoutospecifythetypeoftrafficthatisallowedintoandoutofyournetworkIntranetInternetRouterFirewallConnectingtotheInternetbyUsingNATClientComputersIP=192.168.1.3IP=192.168.1.4IP=192.168.1.5ComputerRunningNATInternalIP=192.168.1.1ExternalIP=131.107.2.11.TheclientsendsthepackettothecomputerrunningNAT4.ThecomputerrunningNATdeterminesthedestination,changesthepacketheader,andsendsthepackettotheclient2.ThecomputerrunningNATchangesthepacketheaderandsendsthepacketovertheInternettotheWebserver3.TheWebserversendsareplytothecomputerrunningNATInternetWebServerIP=131.107.50.1ConnectingtotheInternetbyUsingInternetConnectionSharingConnectingtotheInternetbyUsingInternetConnectionSharing:SimplifiestheprocessofconfiguringNATEnablessmall-officeandhome-officenetworkstoshareasingleconnectiontotheInternetInternetSmall-OfficeorHome-OfficeNetworkInternetConnectionSharingConnectingtotheInternetbyUsingaProxyServerInternetLANProxyServerConnectingtotheInternetbyUsingaProxyServer:ProvidessecuritybyactingasagatewaybetweenyournetworkandtheInternetCachesinformationtoreducetrafficbetweenyourintranetandtheInternetComparingInternetConnectivityOptionsComparingInternetConnectivityOptionsNATvs.RoutingNATvs.ProxyServerInternetConnectionSharingvs.NATConfiguringInternetAccessbyUsingaRouterRoutingandRemoteAccessActionViewTreeLONDON(local)NameRoutingandRemoteAccessServerStatusLONDON(local)RoutingInterfacesPortsAppleTalkRoutingIPRoutingGeneralStaticRoutesIGMPIPXRoutingRemoteAccessPoliciesRemoteAccessLoggingRoutingInterfacesPortsAppleTalkRoutingIPRoutingIPXRoutingRemoteAccessPoliciesRemoteAccessLoggingLONDON(local)PropertiesGeneralSecurityIPIPXAppleTalkPPPEventLoggingRoutingandRemoteAccessEnablethiscomputerasa:RouterLocalareanetwork(LAN)routingonlyLANanddemand-dialroutingRemoteaccessserverOKCancelApplyConfiguringInternetAccessbyUsingNATInstallingNATConfiguringNATInstallingtheRouterInterfaceforNATInstallingNATRoutingandRemoteAccessActionViewTreeGeneralInterfaceRoutingandRemoteAccessServerStatusLONDON(local)RoutingInterfacesPortsAppleTalkRoutingIPRoutingGeneralStaticRoutesIGMPNetworkingRemoteAccessPoliciesRemoteAccessLoggingLoopbackLoopback127.0.0.1UpOpLocalAreaConnectorDedicated192.168.1.200UpOpInternalInternalNotavailableUnknownNoTest_demanddialDemand-dialNotavailableUPDisIPXRoutingTypeIPAddressAdministr…OpNewInterface…NewRoutingProtocol…ShowTCP/IPInformationShowMulticastForwardingTable…ShowMulticastStatisticsViewRefreshExportList…PropertiesHelpConfiguringNATNetworkAddressTranslation(NAT)PropertiesGeneralTranslationAddressAssignmentNameResolutionNetworkAddressTranslation(NAT)GlobalEventlogging:LogerrorsonlyLogerrorsandwarningsLogthemaximumamountofinformationDisableeventloggingOKCancelApplyInstallingtheRouterInterfaceforNATRoutingandRemoteAccessActionViewTreeNetworkAddressTranslation(NAT)InterfaceRoutingandRemoteAccessServerStatusLONDON(local)RoutingInterfacesPortsAppleTalkRoutingIPRoutingGeneralStaticRoutesIGMPNetworkAddressTranslation(NAT)RemoteAccessPoliciesRemoteAccessLoggingIPXRoutingTotalmappingsInboundpack…NewInterface…ShowDHCPAllocatorInformationShowDNSProxyInformation…ViewDeleteRefreshExportList…PropertiesHelpNewInterfaceforNetworkAddressTranslation(NAT)ThisroutingprotocolrunsontheinterfacethatyouselectbelowInterfaces:LocalAreaConnectionOKCancelReviewOptionsforConnectingaNetworktotheInternetConfiguringInternetAccessbyUsingaRouterConfiguringInternetAccessbyUsingNAT