Network Simulators.

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Presentation transcript:

Network Simulators

About Simulation Experiments can be expensive, impossible, complex. Real-System not available, is complex/costly or dangerous (eg: space simulations, flight simulations) Quickly evaluate design alternatives (e.g: different system configurations) Additionally, most measurements are not repeatable so we need simulators About Simulation

What is Network Simulator? A Network Simulator is a piece of software or hardware that predicts the behavior of a network, without an actual network being present. Compared to the cost and time involved in setting up an entire test bed containing multiple networked computers, routers and data links, network simulators are relatively fast and inexpensive Allow engineers to test scenarios that might be particularly difficult or expensive to emulate using real hardware What is Network Simulator?

NS-2 1996-97, ns version 2 (ns-2) was initiated by Steve McCanne. Provides support for simulation of TCP, routing, and multicast protocols over wired and wireless (local and satellite) networks Combination of C++ & Otcl C++ is fast to run but slower to code and change; OTcl is easy to code but runs slowly. Results are not consistent Very complex and time-consuming task It has no GUI Open-source NS-2

QualNet What is QualNet ? Support for various networks Commercial Derivative of GloMoSim Java Based Graphical Interface C based implementation for protocols Modular Design Support for various networks MANET Wired Networks Cellular Networks Satellite Networks QualNet

OPNET Modeler is the commercial product that uses to modeling the networks. In October 2012, OPNET was acquired by Riverbed, for about $1 billion US dollars. It has an enhanced GUI features, user friendly and make it easy to learn. The Modeler supports many technologies including wired-wireless (LAN, MAN, WAN ), Zigbee, Sensor Networks. It support number of Protocols such as OSPF, UDP,TCP, RIP and many more. It incorporates distributed simulations. The advantage of OPNET Modeler is to support Hybrid simulation OPNET Modeler

The OPNET Modeler is to provide many editors for users to design the network. The Editor facilitates to modeling and simulating the network. Other than the editor also provide Graphical User Interface. The 8 Editors listed in: 1. Project Editor 2.Node editor 4. Link Editor 5. Packet Format Editor 6. ICI Editor 7. Packet Editor 8. Probe Editor OPNET Modeler Editor

MATLAB is a numerical computing environment and programming language. Created by The MathWorks, MATLAB allows easy matrix manipulation, plotting of functions and data, implementation of algorithms, creation of user interfaces, and interfacing with programs in other languages. MATLAB is available for Windows, Macintosh and UNIX systems. It is used by more than one million people in industry and academia. What is MATLAB?

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