Download Introduction to Network Simulator NS2 by Ekram Hossain, Teerawat Issariyakul PDF

By Ekram Hossain, Teerawat Issariyakul

An advent to community Simulator NS2 is a beginners’ consultant for community simulator NS2, an open-source discrete occasion simulator designed almost always for networking learn. NS2 has been greatly approved as a competent simulation instrument for laptop conversation networks either in academia and undefined. This publication will current basic NS2 concepts:i) how items (e.g., nodes, hyperlinks, queues, etc.) are assembled to create a community and ii) how a packet flows from one item to a different. in line with those thoughts, this ebook will reveal via examples how new modules should be included into NS2. The ebook will: -Give an outline on simulation and conversation networks. -Provide common details (e.g., deploy, key positive aspects, etc.) approximately NS2. -Demonstrate tips on how to manage an easy community simulation situation utilizing Tcl scripting lanuage. -Explain how C++ and OTcl (Object orientated Tcl) are associated, and represent NS2. -Show how Ns2 translates a Tcl Script and executes it. -Suggest put up simulation processing methods and establish their professionals and cons. -Present a couple of NS2 extension examples. -Discuss tips to comprise MATLAB into NS2.

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To avoid a repetitive typing, which may introduce typos or omissions, a macro can be defined to represent such a long sequence. o and create an executable file file. , $(OBJS) or ${OBJS}). 3. ). 3 NS2 Descriptor File The NS2 descriptor file is defined in a file Makefile located in the home directiory of NS2. It contains the details needed to recompile and relink NS2. The key relevant details are those beginning with the following keywords. • INCLUDES = : The items behind this keyword are the directory which should be included into the NS2 environment.

18 as ˜ns/ and ˜tclcl /, respectively. 30 All NS2 simulation modules ... 18 ... LEVEL 3 common tools tcp queue Commonly-used modules in the interpreted hierarchy LEVEL 4 trace lib tcl Modules in the ... interpreted hierarchy rtglib Fig. 2. Directory structure of NS2 [12]. On Level 3, the modules in the interpreted hierarchy are under directory tcl. tcl) are stored under directory lib on Level 4. Simulation modules in the compiled hierarchy are classified in directories on Level 2. For example, directory tools contains various helper classes such as random variable generators.

The first and second arguments are link delay (d i) and the number of nodes (num nodes), respectively. 1f seconds\n",delay); } Though this coding style solves the flexibility problem, it suffers from a large number of input arguments. 1 are different, we will have to type in all values of link delay every time we run the program. 1. txt) is given in Lines 10–11. 1. The program takes only one input argument which is the configuration file name (See C++ file input/output in [14]). Function readArgFromFile(fp,d) reads the configuration file associated with a file pointer fp, and sets variables num_node and d (the details are not shown here).

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