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1、ExperimentingaLayer2-basedApproachtoInternetConnectivityforAdHocNetworksR.Bruno,M.Conti,E.Gregori,A.PinizzottoE.AncillottiIITInstituteDept.ofInformationEngineeringNationalResearchCouncil(CNR)UniversityofPisaViaG.Moruzzi,1-56124PISA,ItalyViaDiotisalvi2-56122Pisa,ItalyEmail:fr.bruno,m.conti,

2、e.gregori,a.pinizzottog@iit.cnr.itEmail:emilio.ancillotti@iet.unipi.itAbstractAgent(MIP-FA)intheadhocnodethatactsasInternetgate-way,andtorunMobileIPinalltheadhocnodes[1].Adif-Aprerequisiteforthemass-marketdeploymentofmulti-ferentapproachreliesontheimplementationofaNetworkhopadhoctechnologie

3、sisthecapabilityofintegratingwithAddressTranslation(NAT)inthegateway[3],thattrans-existingwiredinfrastructurenetworks.However,currentlatestheIPaddressesofadhocnodestoanaddressonthesolutionstosupportconnectivitybetweenadhocnetworksNATgateway,whichisroutableontheexternalnetwork.andtheInternet

4、arebasedoncomplexmechanisms,suchasSuchapproachesarebasedoncomplexIP-basedmechan-Mobile-IPandIPtunnelling.InthispaperweproposeaismsoriginallydenedforthewiredInternet,liketheIP-in-lightweightsolutionbasedonsimpleLayer-2mechanisms.IPencapsulation,MobileIPandexplicittunnelling,whichExperiments

5、carriedoutinarealtest-bedconrmthevalid-mayintroducesignicantoverheads.Thispaperproposesaityandefciencyofourapproach.lightweighttechniquetoprovideglobalInternetconnectiv-itytotheadhocnodes,usingonlyLayer-2mechanisms.1.IntroductionThebasicideaistologicallyextendawiredLANtotheadhocnodesinat

6、ransparentwayforthewirednodesbyde-Inspiteofthemassiveeffortsinresearchinganddevelop-velopingaspecicProxyARPdaemoninsidethegateway.ingmobileadhocnetworksinthelastdecade,thistypeofExperimentscarriedoutinarealtest-bedconrmthevalid-networkshasnotyetwitnessedawidespreaddeployment.ityandefcien

7、cyofourapproach.Thelowcommercialpenetrationofproductsbasedonadhocnetworkingtechnologiescouldbeexplainedbyconsid-2.BackgroundontheOSLRProtocoleringthatusersareinterestedingeneral-purposeapplica-tionswherehighbandwidthandopenaccesstotheInternetOurtest-bedu