Textbook: T. Issariyakul and E. Hossain, Introduction to Network Simulator NS2, Springer

Transcription

1 An Introduction to NS2 Textbook: T. Issariyakul and E. Hossain, Introduction to Network Simulator NS2, Springer by y Teerwat Issariyakul

2 Outline Overview Installation An Example Incorporate C++ Modules into NS2 Textbook: T. Issariyakul and E. Hossain, Introduction to Network Simulator NS2, Springer by y Teerwat Issariyakul

3 Overview: Network Simulation 3 Simulation i Main Steps 1. Design Things to simulate Assumptions Performance measure 2. Simulation by y Network Configuration Phase Simulation Phase 3. Result Compilation i Debugging and Tracing Compute performance meaures Textbook: T. Issariyakul and E. Hossain, Introduction to Network Simulator NS2, Springer Teerwat Issariyakul 3

4 Overview: NS2 Architecturectur NS2 = Network Simulator 2 Consists of C++: Internal mechanism OTcl: User interface TclCL: Connecting C++ to OTcl y Teerwat Issariyakul Textbook: T. Issariyakul and E. Hossain, Introduction to Network Simulator NS2, Springer Pre

5 Overview: NS2 Invocation Syntax >> ns [<filename>] [<args>] No argument: Enter NS2 environment <filename> = Tcl simulation script; Use OTcl programming lauguage In the Tcl file, <args> is stores in the internal variable ( $argv ). Example >> ns myfirst_ns.tcl To retrieve the second input argument (2), execute ( lindex $argv 1 ) Textbook: T. Issariyakul and E. Hossain, Introduction to Network Simulator NS2, Springer ed by y Teerwat Issariyakul

6 Outline Overview Installation An Example Incorporate C++ Modules into NS2 Textbook: T. Issariyakul and E. Hossain, Introduction to Network Simulator NS2, Springer by y Teerwat Issariyakul

7 Installation: NS2 1. Go to NS2 web page: NS2 Webpage: /nsnam Download Link: build.html#allinone1. l# ll 2. Get all-in-one package NS2, Tcl/Tk, OTcl, TclCL NAM, Zlib, Xgraph 3. Unzip all the files 4. Use the installation tio package./install /i Follow the instruction yi NS2 is designed for Unix For windows, also install Cygwin by Textbook: T. Issariyakul and E. Hossain, Introduction to Network Simulator NS2, Springer Prepar edd Teerwat Issariya yakul

8 Installation: Cygwin Cygwin = Linux emulation for windows 1. Go to Cygwin Webpage: 2. Get the package 3. Install the basic package 4. Install the following owing additional packages: Teerwat Issariya yakul Textbook: T. Issariyakul and E. Hossain, Introduction to Network Simulator NS2, Springer Prep

9 Outline Overview Installation An Example Incorporate C++ Modules into NS2 Textbook: T. Issariyakul and E. Hossain, Introduction to Network Simulator NS2, Springer by y Teerwat Issariyakul

10 A Network Simulation Example sarimp ssa akul Textbook: T. Issariyakul and E. Hossain, Introduction to Network Simulator NS2, Springer Prepa

11 Tcl Simulation Script Filename myfirst_ns.tcl Create a simulator Create trace objects Textbook: T. Issariyakul and E. Hossain, Introduction to Network Simulator NS2, Springer Prep ed y Teerwat Issariya tyakul

12 A Network Simulation Example Define a finish proceduer sarimp t Issa akul Textbook: T. Issariyakul and E. Hossain, Introduction to Network Simulator NS2, Springer Prep

13 A Network Simulation Example Create nodes sarimp at Issa akul Textbook: T. Issariyakul and E. Hossain, Introduction to Network Simulator NS2, Springer

14 A Network Simulation Example sarimp eerw ssa akul Textbook: T. Issariyakul and E. Hossain, Introduction to Network Simulator NS2, Springer Prepa

15 A Network Simulation Example sarimp Connect node with duplex links at Issa akul Textbook: T. Issariyakul and E. Hossain, Introduction to Network Simulator NS2, Springer

16 A Network Simulation Example Textbook: T. Issariyakul and E. Hossain, Introduction to Network Simulator NS2, Springer Preparee sarimp by eerw ssa akul

17 A Network Simulation Example Create a flow from n0 to n3 Create a UDP flow sarimp wat Issa akul Attach a CBR source to the UDP flow Textbook: T. Issariyakul and E. Hossain, Introduction to Network Simulator NS2, Springer by

18 A Network Simulation Example Create a flow from n1 to n4 Create a TCP flow sarimp wat Issa akul by Attach a FTP source to the TCP flow repa Textbook: T. Issariyakul and E. Hossain, Introduction to Network Simulator NS2, Springer af

19 A Network Simulation Example Schedule Events by y Start simulation Textbook: T. Issariyakul and E. Hossain, Introduction to Network Simulator NS2, Springer sarimp Te at Issa akul

20 A Network Simulation Example We are in step two of network simulation Step 1 = ( Design ) Step 3 = ( Result Compilation ) Sub-Step The part of the code by y 1. (Network Configuration) (the rest of the codes ) 2. (Simulation( ) ($ns( run ) 3. ( ) ( ) Textbook: T. Issariyakul and E. Hossain, Introduction to Network Simulator NS2, Springer sarimp Teerwat Issa akul

21 A Network Simulation Example Results? (files out.tr and out.nam ) {enque(+),deque( deque(-) ),receive(r),drop(d)} Textbook: T. Issariyakul and E. Hossain, Introduction to Network Simulator NS2, Springer Prepare d b ssariyakul 21

22 Outline Overview Installation An Example Incorporate C++ Modules into NS2 Textbook: T. Issariyakul and E. Hossain, Introduction to Network Simulator NS2, Springer by y Teerwat Issariyakul

23 New Modules NS2 Modules: C++ and OTcl Directories: i ~ns ~tclcl See Also: htm Textbook: T. Issariyakul and E. Hossain, Introduction to Network Simulator NS2, Springer by Teerw erwat Issariyakul 23

24 New Modules New Modules Need to recompile and links all NEW modules Use make utility byy Make contains a set of things that will be done ewhen make is executed from the command prompt. Textbook: T. Issariyakul and E. Hossain, Introduction to Network Simulator NS2, Springer ed t Teerwa sariyakul Issa

25 Make Utility Make usage >> make [-f <filename>] e>] Executed what specified in <filename> <filename> is called a file descriptor No file is given use file Makefile File descriptor Syntax <target1> [<target2> ] : [<dep1> <dep2> ] <command> Targets are remade if any of the dependency is changed The change is specified in the command. by y Textbook: T. Issariyakul and E. Hossain, Introduction to Network Simulator NS2, Springer Teerwat Issariyakul

26 Example Make Utility cc-o channel main.o, fade.o, model.o Execute ( ) if ( ) is changed main.o, fade.o, and/or model.o Textbook: T. Issariyakul and E. Hossain, Introduction to Network Simulator NS2, Springer Prepare wa ssa sariyakul

27 Make Utility Example: Use variables OBJS and COM ssariya yakul Textbook: T. Issariyakul and E. Hossain, Introduction to Network Simulator NS2, Springer

28 Makefile for NS2 Located in ~ns Key components: INCLUDES = : Directory OBJ_CC = : All NS2 object files NS_TCL_LIB B= : All NS2 OTcl files by y Put your files in these three components parents Textbook: T. Issariyakul and E. Hossain, Introduction to Network Simulator NS2, Springer Prepa d Teerwat Issariyakul

29 Makefile for NS2: Example Use *.o erw ssariyakul Use \ to separate lines Textbook: T. Issariyakul and E. Hossain, Introduction to Network Simulator NS2, Springer P d Prep

30 NS2 consists of Summary OTcl( user interface ) and C++ ( internal mechanism m ) Installation: NS2 + Cygwin An Example Make utility INCLUDE: Directory OBJ_CC: C++ Modules NS_TCL_LIB: OTcl Modules Textbook: T. Issariyakul and E. Hossain, Introduction to Network Simulator NS2, Springer Prep pared by y Teerwat Issariya yakul