set val(chan) Channel/WirelessChannel ;#Channel Type

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

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

set val(mac) Mac/802_11 ;# MAC type

set val(ifq) Queue/DropTail/PriQueue ;# interface queue type

set val(ll) LL ;# link layer type

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

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

set val(nn) 2 ;# number of mobilenodes

set val(rp) DSDV ;# routing protocol

#set val(rp) DSR ;# routing protocol

set val(x) 500

set val(y) 500

#Initialize Global Variables

set ns [new Simulator]

set tracefd [open wireless.tr w]

$ns trace-all $tracefd

set namtracefd [open wireless.nam w]

$ns namtrace-all-wireless $namtracefd $val(x) $val(y)

#set up topography object

set topo [new Topography]

$topo load_flatgrid $val(x) $val(y)

#

#Greate God

#

create-god $val(nn)

set chan_1_ [new $val(chan)]

#

#create the specified of mobilenodes [$val(nn)] and "attach" them

#to the channel

#here two nodes are created:node(0)and node(1)

#configure node

$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 \

-agentTrace ON \

-routerTrace ON \

-macTrace ON \

-movementTrace OFF \

-channel $chan_1_

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

set node_($i) [$ns node]

$node_($i) random-motion 0

;#$ns initial_node_pos $node_($i) 20

}

#

#provide initial(X,Y,for now Z=0) co-ordinates for moilenodes

#

$node_(0) set X_ 5.0

$node_(0) set Y_ 2.0

$node_(0) set Z_ 0.0

$node_(1) set X_ 390.0

$node_(1) set Y_ 385.0

$node_(1) set Z_ 0.0

#

#Now produce some simple node movement

#Node_(1)starts to move to node_(0)

#

$ns at 5.0 "$node_(1) setdest 25.0 20.0 15.0"

$ns at 1.0 "$node_(0) setdest 20.0 18.0 1.0"

#Node_(1) then starts to move away from node_(0)

$ns at 10.0 "$node_(1) setdest 490.0 480.0 30.0"

#Setup traffic flow between nodes

#TCP connection between node_(0) and node_(1)

set tcp [new Agent/TCP]

$tcp set class_ 2

set sink [new Agent/TCPSink]

$ns attach-agent $node_(0) $tcp

$ns attach-agent $node_(1) $sink

$ns connect $tcp $sink

set ftp [new Application/FTP]

$ftp attach-agent $tcp

$ns at 3.0 "$ftp start"

#

#Tell nodes when the simulation ends

#

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

$ns at 15.0 "$node_($i) reset";

}

$ns at 15.0 "stop"

;#$ns at 15.01 "puts \"NS EXITING...\" ; $ns halt"

proc stop {} {

global ns tracefd namtracefd

$ns flush-trace

close $tracefd

close $namtracefd

exec nam wireless.nam&

exit 0

}

;#puts "Starting Simulation..."

$ns run

 

1、这个脚本就没有了第一个脚本里那些类似缺少空格的错误。但是问题在于，书上给的代码是旧版的。新版在无线节点设置时有了改动。所以，节点配置那部分是看的NS2自带的例子。不得不说这个例子给的真的挺有用的。“不用读系列”有时候真的要读一读。

2、书上的这个代码跑出来。视觉效果没有那么强。我最开始以为是发送包的周期没有调整好，就把除了位置信息以外其他参数，都是按照自带的例子设置的。结果还是没有达到例子里的结果。后来我把节点的位置也按照例子里的改了，就一直在发送包了。所以我觉得这里是，因为树上的代码设置的节点位置太远而不发送信号。也就是说，和距离有关！

3、下一步还是要学tcl语言的具体语法

4、再下一步翻一番计网书，和802.11的书。协议什么的都不懂了。现在还是聚焦于代码吧。