Network Simulator 3: A Practical Implementation Guide for Distributed Control Systems
This document presents a comprehensive guide to using Network Simulator 3 (ns-3) for developing and testing distributed control systems. Written in C++ and Python, this project has evolved since mid-2006 and leverages Mercurial for version control and Waf for compilation. The guide highlights key abstractions such as nodes, applications, and topological helpers, and provides detailed code snippets for setting up a simple UDP echo server-client model. Utilize freely available online resources from Bitbucket to enhance your development process.
Network Simulator 3: A Practical Implementation Guide for Distributed Control Systems
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Presentation Transcript
Ns(network simulator)-3 2014/5/20 報告者:蘇宏仁
Programming languages: C++, Python • Manage: Mercurial • Compile: Waf • Project started around mid 2006
Mercurial • 分散式控制系統 • 以PYTHON實作-容易擴充 • 有免費的線上資料庫可以使用 • Bitbucket.org
Key Abstractions • Node • Application • Channel • Net Device • Topology Helpers
標準寫法 • http://www.nsnam.org/developers/contributing-code/coding-style/
First.cc • #include "ns3/core-module.h" • #include "ns3/network-module.h" • #include "ns3/internet-module.h" • #include "ns3/point-to-point-module.h" • #include "ns3/applications-module.h"
using namespace ns3; • NS_LOG_COMPONENT_DEFINE ("FirstScriptExample");
Main Function • Time::SetResolution (Time::NS); • LogComponentEnable("UdpEchoClientApplication", LOG_LEVEL_INFO); • LogComponentEnable("UdpEchoServerApplication", LOG_LEVEL_INFO);
NodeContainer • NodeContainer nodes; • nodes.Create (2);
PointToPointHelper • PointToPointHelper pointToPoint; • pointToPoint.SetDeviceAttribute ("DataRate", StringValue ("5Mbps")); • pointToPoint.SetChannelAttribute ("Delay", StringValue ("2ms"));
NetDeviceContainer • NetDeviceContainer devices; • devices = pointToPoint.Install (nodes);
InternetStackHelper • InternetStackHelper stack; • stack.Install (nodes);
Ipv4AddressHelper • Ipv4AddressHelper address; • address.SetBase ("10.1.1.0", "255.255.255.0"); • Ipv4InterfaceContainer interfaces = address.Assign (devices);
UdpEchoServerHelper • UdpEchoServerHelper echoServer (9); • ApplicationContainer serverApps = echoServer.Install (nodes.Get (1)); • serverApps.Start (Seconds (1.0)); • serverApps.Stop (Seconds (10.0));
UdpEchoClientHelper-1 • UdpEchoClientHelper echoClient (interfaces.GetAddress (1), 9); • echoClient.SetAttribute ("MaxPackets", UintegerValue (1)); • echoClient.SetAttribute ("Interval", TimeValue (Seconds (1.0)));
UdpEchoClientHelper-2 • echoClient.SetAttribute ("PacketSize", UintegerValue (1024)); • ApplicationContainer clientApps = echoClient.Install (nodes.Get (0)); • clientApps.Start (Seconds (2.0)); • clientApps.Stop (Seconds (10.0));
Simulator • Simulator::Run (); • Simulator::Destroy (); • return 0;
result • 執行範例之後，會產生.pcap的檔案 • Tcpdump 可觀看.pcap檔案內容 • 代表真實封包的樣子
