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Code :

# cration d'un simulateur

set ns [new Simulator]

# cration du fichier de trace utilis par lafficheur et indication ns de l'utiliser

set tracefd [open trace.tr w]

set namtrace [open a.nam w]

$ns trace-all $tracefd

$ns namtrace-all-wireless $namtrace 500 400

#Dfinition de la topologie

set topo [new Topography]

$topo load_flatgrid 500 400

#procedure stop

proc stop {} {

global ns tracefd nf namtrace

$ns flush-trace

close $tracefd

close $namtrace

exec nam a.nam &

exit 0

}

#Dfinition des options dun lien sans fil

set val(chan) Channel/WirelessChannel

set val(prop) Propagation/TwoRayGround

set val(netif) Phy/WirelessPhy

set val(mac) Mac/802_11

set val(ifq) Queue/DropTail/PriQueue

set val(ll) LL

set val(ant) Antenna/OmniAntenna

set val(ifqlen) 50

set val(nn) 3

set val(rp) AODV

set val(stop) 150

set val(x) 500

set val(y) 400

#creation de god

create-god $val(nn)

#Configuration des noeuds

set chann [new $val(chan)]

$ns node-config -adhocRouting $val(rp) \

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$ns node-config -llType $val(ll) \

$ns node-config -macType $val(mac) \

$ns node-config \

-ifqType $val(ifq) \

$ns node-config \$ns node-config -ifqLen $val(ifqlen) \

$ns node-config -antType $val(ant) \

$ns node-config -propType $val(prop) \

$ns node-config -phyType $val(netif) \

$ns node-config -channel $chann

$ns node-config -topoInstance $topo \

$ns node-config -agentTrace ON \

$ns node-config -routerTrace ON \

$ns node-config -macTrace ON \

$ns node-config -movementTrace OFF

#creation des noeuds

for {set i 0} {$i < $val(nn) } {incr i} {

set node($i) [$ns node ]

$node($i) random-motion 0 ;

}

#positionnement des noeuds

$node(0) set X_ 5.0$node(0) set Y_ 5.0

$node(0) set Z_ 0.0

$node(1) set X_ 490.0

$node(1) set Y_ 285.0

$node(1) set Z_ 0.0

$node(2) set X_ 150.0

$node(2) set Y_ 240.0

$node(2) set Z_ 0.0

$ns at 10.0 "$node(0) setdest 250.0 250.0 3.0"

$ns at 20.0 "$node(1) setdest 45.0 285.0 5.0"

$ns at 10.0 "$node(2) setdest 480.0 300.0 2.0"

#creation des agents TCP et FTP

set tcp0 [new Agent/TCP]

set tcp1 [new Agent/TCPSink]

$ns attach-agent $node(0) $tcp0

$ns attach-agent $node(1) $tcp1

$ns connect $tcp0 $tcp1

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set ftp [new Application/FTP]

$ftp attach-agent $tcp0

#Simulation

$ns at 10.0 "$ftp start"$ns at 150.0 "stop"

$ns run

Exemple de fichier de trace :

-Le 1erchamp s : send ou r :recieve

-Le 2eme champ correspond linstant dmission ou de rception

-Le 3eme champ au numro du nud

-Le 4eme champ au niveau du paquet : AGT, MAC, RTR..

-Le 5eme : au numro de squence du paquet

-Le 6eme : au protocole

-Le 7eme : la taille du paquet

Question n2 :

a)

tracage de debit moyen en fonction de temps du simulation :

#!/bin/bash

grep tcp trace.tr | grep MAC > fichier1

grep "^s" fichier1 | grep _0_ | cut -d" "fichier1,2,7,9 | head -n 6612 > fichier2

grep "^r" fichier1 | grep _1_ | cut -d" " -fichier1,2,7,9 > fichier3

join -13 -23 fichier2 fichier3 | cut -d" " -fichier1,3,6,7 | awk '{print echo ($3-$2),$4,$3}' |

awk '{print echo ($2/$1),$3}' > valeurs

Explication :

grep tcp trace: slction des lignes contenant "tcp"

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grep MAC : slction des lignes contenant "MAC"

> fichier1:mise des lignes selectionnes dans le fichier fichier1

2eme commande:

grep "^s" fichier1| grep _0_ : On slcitonne les lignes de f1 contenant "s" et "_0_"

| cut -d" "fichier1,2,7,9 | : on extrait les champs suivants: s temps_emission num_sequence taille

head -n 6612 > fichier2 : , puis on garde les 6612 premires lignes pour avoir le

meme nombre de ligne que le dossier fichier3

tracacge :

gnuplot

>plot valeurs using 2 :1 with lines

b) la probabilit de perte = nombre de paquets perdus / nombre total de paquets

nombre de paquets perdus = taille totale des paquets perdus/ taille totale des paquets emis

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grep "^D" trace.tr > traced.tr

grep tcp traced.tr > tracedd.tr

On execute ce script:

#! /bin/bash

somme=0;

while IFS=" " read a b c d e f g h i j

do

let somme=$somme+$h;

echo -e "$somme";

done < tracedd.tr

Explications:

Ona un dbit important puis il diminue

Pour TCP, lorsque un paquet est perdu, le mcanisme de contrle de congestion est initi,qui

diminue la vitesse denvoi des paquets.

Question n4:

set ns [new Simulator]

#number of nodes

set num_wired_nodes 2

set num_mobile_nodes 7

set num_bs_nodes 1 ;# number of base stations

set num_nodes [expr $num_wired_nodes + $num_mobile_nodes + $num_bs_nodes]

set bs_id $num_wired_nodes

# Parameter for wireless nodes

set opt(chan) Channel/WirelessChannel ;# channel type

set opt(prop) Propagation/TwoRayGround ;# radio-propagation model

set opt(netif) Phy/WirelessPhy ;# network interface type

set opt(mac) Mac/802_11e ;# MAC type

set opt(ifq) Queue/DTail/PriQ ;# interface queue type

set opt(ifqlen) 50

set opt(ll) LL ;# link layer type

set opt(ant) Antenna/OmniAntenna ;# antenna model

set opt(ifqlen) 50 ;# max packet in ifq

set opt(adhocRouting) NOAH ;# routing protocol

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set opt(x) 670 ;# X dimension of the topography

set opt(y) 670 ;# Y dimension of the topography

set opt(seed) 0.0 ;# seed for random number gen.

set opt(stop) 250 ;# time to stop simulation

#set up for hierarchical routing#(needed for routing over a basestation)

$ns node-config -addressType hierarchical

AddrParams set domain_num_ 2 ;# domain number

lappend cluster_num 2 2 ;# cluster number for each domain

AddrParams set cluster_num_ $cluster_num

lappend eilastlevel 1 1 4 4;# number of nodes for each cluster

AddrParams set nodes_num_ $eilastlevel

#Open the nam trace file

set nf [open out.nam w]

$ns namtrace-all-wireless $nf $opt(x) $opt(y)set ntr [open out.tr w]

$ns trace-all $ntr

set chan [new $opt(chan)]

set topo [new Topography]

$topo load_flatgrid $opt(x) $opt(y)

# Create God

create-god [expr $num_mobile_nodes + $num_bs_nodes]

# creating wired nodesset temp {0.0.0 0.1.0} ;# hierarchical addresses to be used

for {set i 0} {$i < $num_wired_nodes} {incr i} {

set W($i) [$ns node [lindex $temp $i]]

puts "wired node $i created"

$W($i) set X_ [expr $i * 200 + 10]

$W($i) set Y_ [expr $i * 100 + 10]

$W($i) set Z_ 0.0

}

# creating base station

#$ns node-config -adhocRouting $opt(adhocRouting) \

$ns node-config -adhocRouting DSDV \

$ns node-config -llType $opt(ll) \

-macType $opt(mac) \

-ifqType $opt(ifq) \

-ifqLen $opt(ifqlen) \

-antType $opt(ant) \

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-propType $opt(prop) \

-phyType $opt(netif) \

-channel $chan \

-topoInstance $topo \

-wiredRouting ON \

-agentTrace ON \-routerTrace ON \

-macTrace ON \

set temp {1.0.0 1.0.1 1.0.2 1.0.3 1.1.0 1.1.1 1.1.2 1.1.3} ;# hier address to be used for

;# wireless domain -movementTrace OFF

set BS(0) [$ns node 1.0.0]

#$BS(0) random-motion 0 ;# disable random motion

puts "Base-Station node $bs_id created"#provide some co-ord (fixed) to base station node

$BS(0) set X_ 500.0

$BS(0) set Y_ 150.0

$BS(0) set Z_ 0.0

# creating mobile nodes

$ns node-config -wiredRouting OFF

for {set i 0} {$i < $num_mobile_nodes} {incr i} {

set wl_node_($i) [$ns node [lindex $temp [expr $i+1]] ]

#$wl_node_($i) random-motion 0 ;# disable random motion

puts "wireless node $i created ..."

#$wl_node_($i) base-station [AddrParams addr2id [$BS(0) node-addr]]

$wl_node_($i) set X_ [expr $i * 100 + 75]

$wl_node_($i) set Y_ [expr $i * 150 + 80]

$wl_node_($i) set Z_ 0.0

}

#create links between wired and BS nodes

$ns duplex-link $W(0) $BS(0) 5Mb 2ms DropTail

$ns duplex-link $W(1) $BS(0) 5Mb 2ms DropTail

$ns duplex-link-op $W(0) $BS(0) orient down

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$ns duplex-link-op $W(1) $BS(0) orient left-down

set tcp1 [new Agent/TCP]

$tcp1 set class_ 2set sink1 [new Agent/TCPSink]

$ns attach-agent $wl_node_(0) $tcp1

$ns attach-agent $W(0) $sink1

$ns connect $tcp1 $sink1

set ftp1 [new Application/FTP]

$ftp1 attach-agent $tcp1

$ns at 170.0 "$ftp1 start"

set tcp2 [new Agent/TCP]

$tcp2 set class_ 2set sink2 [new Agent/TCPSink]

$ns attach-agent $W(1) $tcp2

$ns attach-agent $wl_node_(2) $sink2

$ns connect $tcp2 $sink2

set ftp2 [new Application/FTP]

$ftp2 attach-agent $tcp2

$ns at 170.0 "$ftp2 start"

# Define node initial position in nam

for {set i 0} {$i < $num_mobile_nodes} {incr i} {$ns initial_node_pos $wl_node_($i) 20

}

#Tell nodes when the simulation ends

for {set i 0} {$i < $num_mobile_nodes } {incr i} {

$ns at 10.0 "$wl_node_($i) reset";

}

$ns at $opt(stop).0 "$BS(0) reset";

$ns at $opt(stop).0002 "puts \"NS EXITING...\" ; $ns halt"

$ns at $opt(stop).0001 "stop"

proc stop {} {

global ns ntr nf

$ns flush-trace

close $ntr

close $nf

exec nam out.nam &

exit 0

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}

$ns run