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1、AnalysisofInternetServicesinIPoverATMNetworksJavierAracil,DanielMorat,andMikelIzal,PublicUniversityofNavarraABSTRACTThisarticlepresentsatrace-drivenanalysisofIPoverATMser-vicesfromanATM-centricstandpoint.Weprovideacharacteriza-tionofTCPflowsasVBRstreamswithburstiness(MBS)andthroughput(S
2、CR).Ontheotherhand,amacroscopicanalysiscomprisingpercentageofflowsandbytesperservice,TCPaveragetransactionduration,andbytestransferredbothwaysisalsopresented.TheATMlinkunderanalysisconcentratestrafficfromalargepopulationof1,00hostsfromthePub-licUniversityofNavarracampusnetwork,thatprodu
3、ce1,700,000TCPconnectionsapproxi-descriptors,butisalsousefultoevalu-matelyinthemeasurementperiodofoneweek.Theresultsobtainedfromsuchawealthofatetheuser-perceivedQoS.dataindicatethatthesustainedthroughputofWebconnectionsdoesnotgrowbeyond80Ontheotherhand,themostkb/swith70percentprobabilit
4、yinthedatatransferphase(i.e.,intheESTABLISHEDstate),demandedInternetservices(Web,e-andweobserveastronginfluenceoftheconnectionestablishmentphaseontheuser-per-mail,FTP)useTCPasatransportpro-ceivedthroughput.Ontheotherhand,theburstinessofindividualTCPconnectionsistocol.Therefore,thetraffi
5、crathersmall;namely,TCPconnectionsdonotproduceburstsaccordingtothegeometriccharacteristicsoftheInternetflowwilllawgivenbyslowstartandcommonlyassumedinpreviouslypublishedstudies.largelydependonTCPbehavior.ThebehaviorofTCPdependsonalargenumberoffactors,suchastheconges-heincreasingdemandfo
6、rInternetservicesistiononthepathfromtheclienttoserver,thetransmissionTspurringthedeploymentofhigh-speedIPback-windownegotiatedatconnectionestablishment,maximumbones,butthespecificnetworktechnologytobeusedstillsegmentsize,round-triptimeestimation,andprotocolversionremainsanopenissue.Oneo
7、fthemainadvantagesofasyn-(Reno,Tahoe,Vegas),whichprovidedifferentimplementa-chronoustransfermode(ATM)networksisthecapabilitytotionsofdelayedACKandwindowrecoverymechanisms.providedynamicresourceallocationforvideo,voice,anddata,Thus,duetoTCP’scomplexitywenotethatthecurrentstud-th
