网络仿真工具NS3的培训文档.pptx

ns-3 TrainingComputer and Communication Network LabDepartment of Electrical EngineeringNational Sun Yat-Sen University5/13/2013TopicsGetting Started ns-3What is ns-3?InstallationA First ns-3 ScriptTwo tutorial examplesA simple example for this projectComplete the remaining partsGetting Started ns-3What is ns-3?ns-3 is a discrete-event network simulator for Internet systemsns-3 allows researchers to study Internet protocols and large-scale systems in a controlled environmentns-3 is a new simulator (not backwards-compatible with ns-2)ns-3 is a free, open source software project organized around research community development and maintenancethe target user community is networking researchers and educatorsExtensible Software CoreNode BasicsAn ns-3 Node is a husk of a computer to which applications, stacks, and NICs are addedTracing and StatisticsTracing is a structured form of simulation outputExample (from ns-2):Problem: Tracing needs vary widelywould like to change tracing output without editing the corewould like to support multiple outputsns-3 Has A New Tracing Modelns-3 solution: decouple trace sources from trace sinksBenefit: Customizable trace sinksDownloading ns-3Problems under WindowsCygwin or MinGWIf you do use Cygwin or MinGW and use Logitech productsit can cause Cygwin or MinGW DLLs to die in mysterious wayNote that NSC is not supported on OSX or Cygwin.Network Simulation CradleBuilding ns-3 (1/5)# ./build.pyBuilding ns-3 (2/5)# ./waf -d optimized configurens-3 uses the waf build systemBuilding ns-3 (3/5)# ./waf -d debug configureBuilding ns-3 (4/5)# ./test.py -c coreBuilding ns-3 (5/5)Running a Script./waf --run hello-simulatorBuilding Your Script# cp examples/tutorial/first.cc scratch/myfirst.cc./wafBuilding Your Script# ./waf --run scratch/myfirstA First ns-3 Script /ns-allinone-3.10/ns-3.10/examples/tutorialfirst.ccthird.ccBoilerplateThe first line in the file is an emacs mode line. The ns-3 simulator is licensed using the GNU General Public License. Mo