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Network Simulator (NS-2)

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講義 Network Simulator (NS2)

Part 1: 下載 Part 2: 安裝與測試 Part 3: 劇本 Part 4: 數據

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Part 1: 下載

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http://www.isi.edu/nsnam/ns

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Step 1

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Step 2

ns-allinone-2.33.tar.gz約 50MB UP

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Part 2: 安裝與測試

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Setup for Linux-based systems If the file is put at /root

Step 1: cd /root Step 2: tar zxvf ns-allinone-2.33.tar.gz Step 3: cd /root/ns-allinone-2.33 Step 4: ./install

Setup for windows-based systems 安裝流程

http://140.116.72.80/~smallko/ns2/setup.htm 中文教學網站 -柯志亨 (Chih-Heng, Ke) http://140.116.72.80/~smallko/ns2/ns2.htm

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Directory structure

ns-allinone-2.33

tk8.4 bintcl8.4 ns-2.33 nam-1.12…..

Source node(C++)Execute files

AODV

aodv.cc, aodv.h, aodv_packet.h

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Overview for NS2 structure

C++ network elem ents

Otcl script ns trace fileuser

perl script results

visualisation tool diagram

nam

generates

uses

nam trace file

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Part 3: 劇本 1

Base station (original data server)

Mobile host

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set ns_ [new Simulator] set tracefd [open Trace w] $ns_ trace-all $tracefd

set nf [open BS_MH_nam w] $ns_ namtrace-all-wireless $nf 1550 1550

set topo [new Topography] $topo load_flatgrid 1550 1550 create-god 3

$ns_ node-config -adhocRouting AODV \ -llType LL \ -macType Mac/802_11 \ -ifqType Queue/DropTail/PriQueue \ -ifqLen 50 \ -antType Antenna/OmniAntenna \ -propType Propagation/TwoRayGround \ -phyType Phy/WirelessPhy \ -channelType Channel/WirelessChannel \ -topoInstance $topo \ -agentTrace ON \ -routerTrace ON \ -macTrace OFF \ -movementTrace OFF

BS_MH_1.tcl

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for {set i 0} {$i < 3 } {incr i} { set node_($i) [$ns_ node] $node_($i) random-motion 0 }

set udp0 [new Agent/UDP] set null0 [new Agent/Null] $ns_ attach-agent $node_(1) $udp0 $ns_ attach-agent $node_(2) $null0 $ns_ connect $udp0 $null0 set cbr0 [new Application/Traffic/CBR] $cbr0 set type_ CBR $cbr0 set packet_size_ 500 $cbr0 set interval_ 0.5 $cbr0 attach-agent $udp0

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$node_(0) set X_ 1 $node_(0) set Y_ 1 $ns_ at 0 "$node_(0) setdest 1 1 1"

$node_(1) set X_ 500 $node_(1) set Y_ 500 $ns_ at 0 "$node_(1) setdest 500 500 1"

$node_(2) set X_ 500 $node_(2) set Y_ 400 $ns_ at 0 "$node_(2) setdest 500 400 1"

$ns_ at 100 "$cbr0 start" $ns_ at 100 "$cbr0 stop" $ns_ at 100 "stop"

proc stop {} { global ns_ tracefd $ns_ flush-trace close $tracefd exit 0 }

$ns_ run

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執行劇本 Step 1: cd /root/ns-allinone-2.33

Step 2: cd bin

Step 3: ./ns my_scenario.tcl

Option Step 4: ./nam BS_MH_nam

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Useful additional program

NAM: Viewing network simulation traces and real world packet traces

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自行撰寫劇本產生器

Network size, Number of nodes, Simulation time

EX: ./scenario_generator 1500 1500 50 300 my_scenario.tcl

PS:這隻程式請自行撰寫，之後會繼續用到且延伸。 由於是產生”文字檔”，所以任何語言且可以。

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Event-driven for Node

1. Create timer AODV.h AODV.cc

… … E9 E8 E7 E6 E5 E4 E3 E2 E1

Simulation Time

Event 1

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aodv.h

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aodv.h

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aodv.h

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aodv.cc

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aodv.cc

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aodv.cc

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aodv.h

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aodv.cc

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How to compile source code? 1. cd /root/ns-allinone-2.33/ns-2.33 2. make

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aodv.cc

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aodv.cc

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aodv_packet.h

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aodv.cc

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aodv.cc

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aodv.cc

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aodv.h

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aodv.cc

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Part 4: 數據

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aodv.cc

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aodv.cc

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劇本 2: Measure the Round-Trip Time (RTT)

Base station (original data server)

Mobile host

RTT (ms)

data size (bytes)

100 200 300 400 500 1000

Number of node:20, 50Overall query rate: 5Simulation time: 100