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ABSTRACT
A detailed introduction to the design, implementation, and use of network simulation tools is presented. The requirements and issues faced in the design of simulators for wired and wireless networks are discussed. Abstractions such as packet- and fluid-level network models are covered. Several existing simulations are given as examples, with details and rationales regarding design decisions presented. Issues regarding performance and scalability are discussed in detail, describing how one can utilize distributed simulation methods to increase the scale and performance of a simulation environment. Finally, a case study of two simulation tools is presented that have been developed using distributed simulation techniques. This text is essential to any student, researcher, or network architect desiring a detailed understanding of how network simulation tools are designed, implemented, and used.



CONTENTS

1. Introduction
1.1 Why Simulate?
1.2 Network Simulator Capabilities
1.3 What is Simulated?

2. Network Simulators
2.1 Simulation Architecture
2.2 Simulator State Objects
2.2.1 Node Objects
2.2.2 Interface Objects
2.2.3 Link Objects
2.2.4 Queue Objects
2.2.5 Protocol Objects
2.2.6 Packet Objects
2.2.7 Application Objects
2.2.8 Support Objects
2.3 An Example Simulator
2.3.1 Create a Simulator Object
2.3.2 Create Nodes
2.3.3 Create Links
2.3.4 Create Applications
2.3.5 Run the Simulation
2.3.6 Print the Results
2.4 Summary

3. Wire-Line Network Simulation
3.1 Modeling Alternatives
3.2 Packet-Level Models
3.2.1 Event List Management
3.2.2 Modeling Packet Routing
3.2.3 Interfacing Simulated Networks with Real Networks
3.3 Fluid Models

4. Wireless Network Simulation
4.1 Broadcast Transmissions
4.2 Path Loss Calculations
4.3 Mobility
4.4 Ad Hoc Routing

5. Performance, Scalability, and Parallel Model Execution
5.1 Simulator Performance
5.2 Time-Parallel Simulation
5.3 Space-Parallel Simulation
5.3.1 Synchronization Algorithms
5.3.2 Conservative Synchronization
5.3.3 Optimistic Synchronization
5.4 A Case Study in Parallel Network Simulation
5.4.1 RTI-Kit
5.4.2 PDNS
5.4.3 GTNetS
5.4.4 Methodology
5.4.5 Validation
5.4.6 Hardware Platforms
5.4.7 Performance Measurements
6. The Future

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