NS 3 training huong dan su dung NS3

Mô phỏng, đánh giá hiệu năng mạng là một vấn đề được nghiên cứu gần đây,Sử dung NS2 có thể gây rắc rối cho người dung vì sử dung các ngôn ngữ khác và khó viết kịch bản cũng như them các module.NS3 là bộ mô phỏng mạng dung C++ và dễ dàng cho việc phát triển cũng như them mới module

ns-3 Training

Computer and Communication Network Lab Department of Electrical Engineering National Sun Yat-Sen University

5/13/2013

 Two tutorial examples

 A simple example for this project

 Complete the remaining parts

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 ns-3 is a free, open source software project

organized around research community

development and maintenance

 the target user community is networking researchers and educators

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Extensible Software Core

 Written in C++ with optional Python interface

 extensively documented API (doxygen):

 http://www.nsnam.org/doxygen-release/index.html

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Node Basics

 An ns-3 Node is a husk of a computer to which applications, stacks, and NICs are added

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Tracing and Statistics

 Tracing is a structured form of simulation output

 Example (from ns-2):

 Problem: Tracing needs vary widely

 would like to change tracing output without editing the core

 would like to support multiple outputs 7

ns-3 Has A New Tracing Model

 ns-3 solution: decouple trace sources from trace sinks

 Benefit: Customizable trace sinks

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Downloading ns-3

 http://www.nsnam.org/

 Latest release: ns-3.16 (2012/12/21)

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Problems under Windows

 Note that NSC is not supported on OSX or Cygwin

 Network Simulation Cradle

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Building ns-3 (1/5)

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 # /build.py

Building ns-3 (2/5)

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 # /waf -d optimized configure

 ns-3 uses the waf build system

Building ns-3 (3/5)

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 # /waf -d debug configure

Building ns-3 (4/5)

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 # /test.py -c core

Building ns-3 (5/5)

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Running a Script

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 /waf run hello-simulator

Building Your Script

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 # cp examples/tutorial/first.cc scratch/myfirst.cc

 /waf

Building Your Script

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 # /waf run scratch/myfirst

A First ns-3 Script

• /ns-allinone-3.10/ns-3.10/examples/tutorial

• first.cc

• third.cc

 The first line in the file is an emacs mode line

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 The ns-3 simulator is licensed using the GNU

General Public License

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1.NS_LOG_ERROR — Log error messages;

2.NS_LOG_WARN — Log warning messages;

3.NS_LOG_DEBUG — Log relatively rare, ad-hoc debugging messages;

4.NS_LOG_INFO — Log informational messages about program progress;

5.NS_LOG_FUNCTION — Log a message describing each function called;

6.NS_LOG_LOGIC – Log messages describing logical flow within a function;

7.NS_LOG_ALL — Log everything

8.NS_LOG_UNCOND – Log the associated message unconditionally

Internet Stack Helper

 Protocol stacks installed on our nodes

 UdpEchoClientHelper

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 What we need to do at this point is to actually

run the simulation

Building Your Script

 Drop your script into the scratch directory

Building Your Script

 You can now run the example

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Building a Wireless Network Topology

 Add the Wifi and the mobility modules

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 The network topology illustration follows:

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Building a Wireless Network Topology

 For enabling or disabling logging components

and for changing the number of devices created

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Building a Wireless Network Topology

 Part of the Wifi network

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 Configure the PHY and channel helpers

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 Yet Another Network Simulator

 M Lacage and T R Henderson, “Yet Another Network Simulator,” WNS2 ns-2: The IP Network Simulator, Italy, 2006.

 http://cutebugs.net/files/wns2-yans.pdf

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Building a Wireless Network Topology

 Create a channel object and associate it to our

PHY layer object manager

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 NqosWifiMacHelper object to set MAC parameters

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 rate control algorithm

 AARF (Adaptive Auto-Rate Fallback ) algorithm 35

Building a Wireless Network Topology

 The SSID of the infrastructure network

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 Create the wifi devices of these stations

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Building a Wireless Network Topology

 Configure the AP (access point) node

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 Shares the same set of PHY-level Attributes

(and channel) as the stations

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Building a Wireless Network Topology

 Set some Attributes controlling the “position

Building a Wireless Network Topology

 Need to tell them how to move

Building a Wireless Network Topology

 Want the access point to remain in a fixed

position during the simulation

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 Protocol stacks

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Building a Wireless Network Topology

 assign IP addresses to the device interfaces

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Building a Wireless Network Topology

 Enable internetwork routing

Building a Wireless Network Topology

 Run the simulation, clean up and then exit the program

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 Output

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Read the pcap files

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Plot figures

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An Example of MANET

• Reference

• hidden-terminal.cc

/ns-allinone-3.10/ns-3.10/examples/wireless/wifi-Codes (1/7)

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Codes (2/7)

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Codes (3/7)

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Codes (4/7)

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Codes (5/7)

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Codes (6/7)

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Codes (7/7)

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Q & A

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