网络仿真工具NS3培训文档

网络仿真工具NS3培训文档第一页，共58页。TopicsGettingStartedns-3Whatisns-3?InstallationAFirstns-3ScriptTwotutorialexamplesAsimpleexampleforthisprojectCompletetheremainingparts2第二页，共58页。GettingStartedns-3Pleasereadthefollowingdocumentsns-3overviewns-3Tutorialns-3Manual第三页，共58页。Whatisns-3?ns-3isadiscrete-eventnetworksimulatorforInternetsystemsns-3allowsresearcherstostudyInternetprotocolsandlarge-scalesystemsinacontrolledenvironmentns-3isanewsimulator(notbackwards-compatiblewithns-2)ns-3isafree,opensourcesoftwareprojectorganizedaroundresearchcommunitydevelopmentandmaintenancethetargetusercommunityisnetworkingresearchersandeducators4第四页，共58页。ExtensibleSoftwareCoreWritteninC++withoptionalPythoninterfaceextensivelydocumentedAPI(doxygen):5第五页，共58页。NodeBasicsAnns-3Nodeisahuskofacomputertowhichapplications,stacks,andNICsareadded6第六页，共58页。TracingandStatisticsTracingisastructuredformofsimulationoutputExample(fromns-2):Problem:Tracingneedsvarywidelywouldliketochangetracingoutputwithouteditingthecorewouldliketosupportmultipleoutputs7第七页，共58页。ns-3HasANewTracingModelns-3solution:decoupletracesourcesfromtracesinksBenefit:Customizabletracesinks8第八页，共58页。Downloadingns-3Latestrelease:ns-3.16

(2012/12/21)9第九页，共58页。ProblemsunderWindowsCygwinorMinGWIfyoudouseCygwinorMinGWanduseLogitechproductsitcancauseCygwinorMinGWDLLstodieinmysteriouswayNotethatNSCisnotsupportedonOSXorCygwin.NetworkSimulationCradle10第十页，共58页。Buildingns-3(1/5)#./build.py11第十一页，共58页。Buildingns-3(2/5)#./waf-doptimizedconfigurens-3usesthewafbuildsystem12第十二页，共58页。Buildingns-3(3/5)#./waf-ddebugconfigure13第十三页，共58页。Buildingns-3(4/5)#./test.py-ccore14第十四页，共58页。Buildingns-3(5/5)15第十五页，共58页。RunningaScript./waf--runhello-simulator16第十六页，共58页。BuildingYourScript#cpexamples/tutorial/first.ccscratch/myfirst.cc./waf17第十七页，共58页。BuildingYourScript#./waf--runscratch/myfirst18第十八页，共58页。AFirstns-3Script/ns-allinone-3.10/ns-3.10/examples/tutorialfirst.ccthird.cc第十九页，共58页。BoilerplateThefirstlineintheanemacsmodeline.

Thens-3simulatorislicensedusingtheGNUGeneralPublicLicense.

20第二十页，共58页。ModuleIncludesThecodeproperstartswithanumberofincludestatements.

../../build/debug/ns321第二十一页，共58页。Ns3NamespaceThenextlineinthefirst.ccscriptisanamespacedeclaration.

Logging

22第二十二页，共58页。MainFunctionsThenextlinesofthescriptyouwillfindare,

ns3提供的log訊息分成了以下幾個等級：NS_LOG_ERROR—Logerrormessages;NS_LOG_WARN—Logwarningmessages;NS_LOG_DEBUG—Logrelativelyrare,ad-hocdebuggingmessages;NS_LOG_INFO—Loginformationalmessagesaboutprogramprogress;NS_LOG_FUNCTION—Logamessagedescribingeachfunctioncalled;NS_LOG_LOGIC–Logmessagesdescribinglogicalflowwithinafunction;NS_LOG_ALL—Logeverything.NS_LOG_UNCOND–Logtheassociatedmessageunconditionally.23第二十三页，共58页。TopologyHelpersCreatethens-3Nodeobjectsthatwillrepresentthecomputersinthesimulation.

Weareconstructingapointtopointlink

24第二十四页，共58页。TopologyHelpersWewillneedtohavealistofalloftheNetDeviceobjectsthatarecreated

25第二十五页，共58页。InternetStackHelperProtocolstacksinstalledonournodes

TCP,UDP,IP,etc.Ipv4AddressHelper

maketheassociationbetweenanIPaddressandadevice26第二十六页，共58页。ApplicationsTwospecializationsofthecorens-3classApplicationcalledUdpEchoServerApplicationUdpEchoClientApplicationUdpEchoServerHelper

27第二十七页，共58页。ApplicationsUdpEchoClientHelper

28第二十八页，共58页。SimulatorWhatweneedtodoatthispointistoactuallyrunthesimulation.

scheduledeventsinthesimulatorat1.0seconds,2.0secondsandtwoeventsat10.0seconds

29第二十九页，共58页。BuildingYourScriptDropyourscriptintothescratchdirectory

Nowbuildyourfirstexamplescriptusingwaf

30第三十页，共58页。BuildingYourScriptYoucannowruntheexample

31第三十一页，共58页。BuildingaWirelessNetworkTopologyAddtheWifiandthemobilitymodules

Thenetworktopologyillustrationfollows:32第三十二页，共58页。BuildingaWirelessNetworkTopologyForenablingordisablingloggingcomponentsandforchangingthenumberofdevicescreated

33第三十三页，共58页。BuildingaWirelessNetworkTopologyPartoftheWifinetwork

ConfigurethePHYandchannelhelpers

YetAnotherNetworkSimulatorM.LacageandT.R.Henderson,“YetAnotherNetworkSimulator,”WNS2ns-2:TheIPNetworkSimulator,Italy,2006.34第三十四页，共58页。BuildingaWirelessNetworkTopologyCreateachannelobjectandassociateittoourPHYlayerobjectmanager

NqosWifiMacHelperobjecttosetMACparameters

ratecontrolalgorithmAARF(AdaptiveAuto-RateFallback)algorithm35第三十五页，共58页。BuildingaWirelessNetworkTopologyTheSSIDoftheinfrastructurenetwork

Createthewifidevicesofthesestations

36第三十六页，共58页。BuildingaWirelessNetworkTopologyConfiguretheAP(accesspoint)node

SharesthesamesetofPHY-levelAttributes(andchannel)asthestations

37第三十七页，共58页。BuildingaWirelessNetworkTopologySetsomeAttributescontrollingthe“positionallocator”functionality

Thenumberofobjectslayedoutonaline.38第三十八页，共58页。BuildingaWirelessNetworkTopologyNeedtotellthemhowtomoveRandomWalk2dMobilityModelrandomdirectionrandomspeed

Rectangle(double_xMin,double_xMax,double_yMin,double_yMax)

39第三十九页，共58页。BuildingaWirelessNetworkTopologyWanttheaccesspointtoremaininafixedpositionduringthesimulation

Protocolstacks

40第四十页，共58页。BuildingaWirelessNetworkTopologyassignIPaddressestothedeviceinterfaces

41第四十一页，共58页。BuildingaWirelessNetworkTopologyEnableinternetworkrouting

Createjustenoughtracingtocoverallthreenetworks

42第四十二页，共58页。BuildingaWirelessNetworkTopologyRunthesimulation,cleanupandthenexittheprogram

Output

43第四十三页，共58页。Readthepcapfiles

44第四十四页，共58页。Plotfigures

45第四十五页，共58页。AnExampleofMANETReference/ns-allinone-3.10/ns-3.10/examples/wireless/wifi-hidden-terminal.cc第四十六页，共58页。Codes(1/7)47第四十七页，共58页。Codes(2/7)48