# VARIABLE PARTset val(chan)           Channel/WirelessChannel    ;# channel typeset val(prop)           Propagation/TwoRayGround   ;# radio-propagation modelset val(netif)          Phy/WirelessPhy            ;# network interface typeset val(mac)            Mac/802_11                 ;# MAC typeset val(ifq)            Queue/DropTail/PriQueue    ;# interface queue typeset val(ll)             LL                         ;# link layer typeset val(ant)            Antenna/OmniAntenna        ;# antenna modelset val(ifqlen)         50                         ;# max packet in ifqset val(nn)             2                          ;# number of mobilenodesset val(rp)             AODV                       ;# routing protocolset val(x)      100set val(y)      100set filename       resultMac/802_11 set RTSThreshold_ 1000# TRACE PARTset ns_     [new Simulator]set tracefd     [open $filename.tr w]$ns_ use-newtrace$ns_ trace-all $tracefdset namtrace [open $filename.nam w]$ns_ namtrace-all-wireless $namtrace $val(x) $val(y)set topo       [new Topography]$topo load_flatgrid $val(x) $val(y)create-god $val(nn)# NODE CONFIG PART$ns_ node-config -adhocRouting $val(rp) \         -llType $val(ll) \	 -macType $val(mac) \	 -ifqType $val(ifq) \	 -ifqLen $val(ifqlen) \	 -antType $val(ant) \	 -propType $val(prop) \	 -phyType $val(netif) \	 -topoInstance $topo \	 -channelType $val(chan) \	 -agentTrace ON \	 -routerTrace ON \	 -macTrace ON \	 -movementTrace OFFset node_(0) [$ns_ node]$node_(0) random-motion 0set node_(1) [$ns_ node]$node_(1) random-motion 0# GRAPH PART$node_(0) set X_ 11$node_(0) set Y_ 11$node_(0) set Z_ 0.0$node_(1) set X_ 111$node_(1) set Y_ 11 $node_(1) set Z_ 0.0for {set i 0} {$i < $val(nn) } {incr i} {    $ns_ initial_node_pos $node_($i) 50}set udp0 [new Agent/UDP]set cbr0 [new Application/Traffic/CBR]set null2 [new Agent/Null]$cbr0 set packetSize_ 548$cbr0 set maxpkts_ 3$ns_ attach-agent $node_(0) $udp0$ns_ attach-agent $node_(1) $null2$udp0 set packetSize_ 1500$cbr0 attach-agent $udp0$ns_ connect $udp0 $null2$ns_ at 0.03 "$cbr0 start"for {set i 0} {$i < $val(nn) } {incr i} {    $ns_ at 5.0 "$node_($i) reset";}$ns_ at 5.0001 "stop"$ns_ at 5.0002 "puts \"NS EXITING... \";"proc stop {} {     global ns_ tracefd     global ns_ namtrace     $ns_ flush-trace     close $tracefd     close $namtrace}puts "Starting Simulation..."$ns_ run