Ns-3 Tutorial Xin Li.

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Presentation transcript:

Ns-3 Tutorial Xin Li

Introduction

What is ns-3? Network Simulator Version 3 Software simulated models Discrete-event simulator Written in C++/Python binding Focus on packet level Wired/Wireless

Why ns-3? Simulation V.S. Testbed Reproducibility Ease of deployment Investigate non-existed systems Scalability Ns-3 V.S. other simulation tools Community-oriented Free and open-source Ease of debugging

Setup

Installation Instructions https://www.nsnam.org/wiki/Installation Supported systems Linux MacOS FreeBSD Windows Linux through virtual machine

Development Environment IDE Eclipse QT Creator NetBeans Text editor + command line

Models

The Basic NS-3 Data Flow Model Application Protocol stack Node NetDevice Sockets-like API Channel Packet(s)‏

NS-3 Models: Node & App Nodes End-Systems, Routers, Hubs, NATs Applications Bulk TCP transfer TCP/UDP “On-Off” application Web browsing Peer-to-peer file transfers Video streaming Chat

NS-3 Models: Protocol Stack TCP-UDP-IPV4-IPV6 Routing Protocols BGP – OSPF – EIGRP – OLSR – DSR – AODV Multicast Protocols PIM-SM/DM - DVMRP

NS-3 Models: Net Device & Channel Net Devices & Channels bound WifiNetDevice WifiChannel

NS-3 Models: Net Device & Channel Network Interfaces Wired/Wireless Layer 2 protocols 802.3, 802.11 Channel Ethernet (10/100/1000Mb) Point-to-Point Wireless Mobility Models Random Walk – Specific Waypoint - Swarming

Usage

NS-3 Modules API: https://www.nsnam.org/doxygen/

NS-3 Build For those familiar with autotools: configure -> ./waf -d [optimized|debug] configure make -> ./waf make test -> ./waf check (run unit tests)‏ Can run programs through a special waf shell ./waf --run simple-point-to-point

Network Simulation Flowchat Create topology Nodes, Links, Queues, Routing, etc. Create data demand on network Web browsers, FTP transfers Run simulation Analyze results

Smart Pointers ns-3 objects are memory managed by a reference counting smart pointer implementation Easier memory management Treat a smart pointer like a regular pointer

Attributes Changing objects' characteristics Member Function Config System

Random Variables Currently implemented distributions Uniform, Poisson Process, etc. Usage

Callbacks Allow one piece of code to call a function without any specific inter- module dependency Example:

Timing and Schedule Time is not manipulated directly: the Time class Example:

Logging ns-3 provides a selectable, multi-level approach to message logging Logging can be disabled completely enabled on a component-by-component basis enabled globally

Logging Seven levels of log messages of increasing verbosity: NS_LOG_ERROR NS_LOG_WARN NS_LOG_DEBUG NS_LOG_INFO NS_LOG_FUNCTION NS_LOG_LOGIC NS_LOG_ALL Each level can be requested singly or cumulatively

Logging Example: Enable outside code:

Tracing Tracing Changes Producer Consumer Pattern

Tracing Helper Connecting source and sink

Visualization Live visualization with PyViz

Useful Resources NS-3 Wiki Page https://www.nsnam.org/wiki/Main_Page NS-3 Tutorial https://www.nsnam.org/docs/tutorial/html/ NS-3 API Document https://www.nsnam.org/docs/release/3.17/doxygen/index.html