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1、NetworkEmulationRVSTorstenBraunComputerNetworksandDistributedSystemsInstituteofComputerScienceandAppliedMathematicsUniversityofBern,Switzerlandwww.iam.unibe.ch/~rvsEcoled’étéInternetNouvelleGénération,June14-18,2004,Obernai2/52OverviewRV§MotivationS§ImplementationandLiveTests§S
2、imulation§EmulationJune15,2004lTypesofEmulationlDetailofEmulationlCentralizedvs.DistributedEmulationlLayersofEmulationlRequirementsonEmulation§ExampleslSimpleDelayLineModelling§NetworkEmulatorforAdaptiveApplications,Hitbox,OhioNetworkEmulator,Dummynet,NISTNetlDetailedModellingo
3、fVirtualNetworks§VINT/nse,ModelNet,Netbed,IP-TNE,VirtualRouters,PlanetLablEmulationinMobileNetworks§Trace-BasedMobileNetworkEmulation,MobiEmuTorstenBraun(UniversityofBern):NetworkEmulation§Conclusions§References3/52MotivationRV§NetworksdonotonlygetfasterbutSbecomemorediverseand
4、carrydiversetraffic.§Networksvarylinbandwidth,llatency,June15,2004lerrorandlossratesandmaybeasymmetric.§ApplicationdemandsvarylReal-timerequirementslReliability®AdaptiveapplicationslBehaviourisoftennotdeterministic.lNewadaptiveapplicationsandprotocolsneedtobeevaluatedinnon-simp
5、listicnetworkenvironmentsthatarereproducible.§EvaluationlImplementationandLiveTestslSimulationTorstenBraun(UniversityofBern):NetworkEmulationlEmulation4/52ImplementationandLiveTestsRVS§Realenvironmentforrunningcode§AdvantageslMostrealisticenvironmentJune15,2004§ProblemslDifficu
6、ltandexpensivetosetuplLimitedinsizeandcomplexitylInterferencewithproductionnetworkslReproducibilitylRestrictedtoexistingtechnologiesTorstenBraun(UniversityofBern):NetworkEmulation5/52SimulationRV§SyntheticenvironmentforrunningSrepresentationsofcode§AdvantageslFullcontrolovertar
7、getplatformJune15,2004lInvestigationofcomplexnetworktopologiesandconditionslNotlimitedbyspeedofsimulationhardwarelLowcostlFlexibility§ProblemslModellingoftraffic(®traffictraces)lIndependentspecificationofnetworkcode.Simulatormightfailtomimicsubtletiesofrealcode.TorstenBraun(Uni
8、versityofBern):NetworkEmulationlMissingsysteminteracti
