网路实验-安装无线区域网路网卡以及架设AP

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1、網路實驗-安裝無線區域網路網卡以及架設AP授課教師:侯廷昭教授1Outline實驗目的與設備實驗所需相關知識WLAN技術WEP技術NAT技術iptablesDHCP技術Bridge2Outline實驗目的與設備實驗所需相關知識WLAN技術WEP技術NAT技術iptablesDHCP技術Bridge3實驗目的與設備實驗目的熟悉IEEE802.11無線區域網路通訊協定在Linux作業系統上安裝WirelessLANcard將PC設定為具有橋接器(Bridge)和NAT(NetworkAddressTr

2、anslation)功能的AccessPoint(AP)將PC設定為具有加密(WEP)功能的AccessPoint4實驗目的與設備實驗設備個人電腦一部無線區域網路網卡LinuxOS2.6乙太網路網卡一張PublicIPaddress測試電腦5Outline實驗環境與設備實驗所需相關知識WLAN技術WEP技術NAT技術iptablesDHCP技術Bridge6實驗所需相關知識-WLANStimulatedbyavailabilityofunlicensedspectrumU.S.Industrial

3、,Scientific,Medical(ISM)bands902-928MHz,2.400-2.4835GHz,5.725-5.850GHzIEEE802FamilyTree7實驗所需相關知識-WLANIEEE802.11Standards8實驗所需相關知識-WLANNomenclatureDistributionSystem:alogicalcomponentof802.11usedtoforwardframestotheirdestinationsAccessPoints:performthe

4、wireless-to-wiredbridgingfunctionWirelessMediumStations9實驗所需相關知識-WLANBasicServiceSet(BSS)GroupofstationsthatcoordinatetheiraccessusingagiveninstanceofMACLocatedinaBasicServiceArea(BSA)StationsinBSScancommunicatewitheachotherDistinctcollocatedBSS’scanc

5、oexist10實驗所需相關知識-WLANTypesofNetworksIndependentnetworks(indep.basicserviceset,IBSS),alsoknownasadhocnetworks.Infrastructurenetworks11實驗所需相關知識-WLANInfrastructureBSSTwoadvantagesforinfrastructurenetworksThemobilestationsneednottomaintainneighborrelation

6、ships.AccesspointsassistwithstationsattemptingtosavepowerInaninfrastructurenetwork,stationsmustassociatewithanAPtoobtainnetworkservices.(equivalenttopluginthenetworkcable)12實驗所需相關知識-WLANExtendedServiceSetAnextendedserviceset(ESS)iscreatedbychainingBSS

7、stogetherwithabackbonenetwork(ordistributionSystem,DS)AlltheaccesspointsinanESSaregiventhesameservicesetidentifier(SSID),whichservesasanetwork"name"fortheusers13實驗所需相關知識-WLAN14實驗所需相關知識-WLANForstationsinanESStocommunicatewitheachother,thewirelessmedium

8、mustactlikeasinglelayer2connection.Accesspointsactasbridges,sodirectcommunicationbetweenstationsinanESSrequiresthatthebackbonenetworkalsolooklikealayer2connection15實驗所需相關知識-WLANDistributionSystemThedistributionsystemisresponsiblefortrackingwhe