Sir
i was executing an example tcl file for wired cum wireless networking from
www.isi.edu/nsnam/ns/tutorial/nsscript6.html.
But it shows the error' ns_(0)variable can't be read' at line number 114 .what could be the problem?
Coding is given below
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_11 ;# MAC type
set opt(ifq) Queue/DropTail/PriQueue ;# interface queue type
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) DSDV ;# routing protocol
set opt(cp) "" ;# connection pattern file
set opt(sc) "./scen/scen-3-test" ;# node movement file.
set opt(x) 670 ;# x coordinate of topology
set opt(y) 670 ;# y coordinate of topology
set opt(seed) 0.0 ;# seed for random number gen.
set opt(stop) 250 ;# time to stop simulation
set opt(ftp1-start) 100
set opt(ftp2-start) 150
set num_wired_nodes 2
set num_bs_nodes 1
# accpet input parameter
set opt(nn) [lindex $argv 0]
set outfile_ [lindex $argv 1]
# ================================================================
# check for boundary parameters and random seed
if { $opt(x) == 0 || $opt(y) == 0 } {
puts "No X-Y boundary values given for wireless topology\n"
}
if {$opt(seed) > 0} {
puts "Seeding Random number generator with $opt(seed)\n"
ns-random $opt(seed)
}
# create simulator instance
set ns_ [new Simulator]
# set up for hierarchical routing
$ns_ node-config -addressType hierarchical
AddrParams set domain_num_ 2 ;# number of domains
lappend cluster_num 2 1 ;# number of clusters in each domain
AddrParams set cluster_num_ $cluster_num
lappend eilastlevel 1 1 4 ;# number of nodes in each cluster
AddrParams set nodes_num_ $eilastlevel ;# of each domain
set tracefd [open $outfile_.tr w]
set namtrace [open $outfile_.nam w]
$ns_ trace-all $tracefd
$ns_ namtrace-all-wireless $namtrace $opt(x) $opt(y)
# Create topography object
set topo [new Topography]
# define topology
$topo load_flatgrid $opt(x) $opt(y)
# create God
create-god [expr $opt(nn) + $num_bs_nodes]
#create wired nodes
set temp {0.0.0 0.1.0} ;# hierarchical addresses for wired domain
for {set i 0} {$i < $num_wired_nodes} {incr i} {
set W($i) [$ns_ node [lindex $temp $i]]
}
# configure for base-station node
$ns_ node-config -adhocRouting $opt(adhocRouting) \
-llType $opt(ll) \
-macType $opt(mac) \
-ifqType $opt(ifq) \
-ifqLen $opt(ifqlen) \
-antType $opt(ant) \
-propType $opt(prop) \
-phyType $opt(netif) \
-channelType $opt(chan) \
-topoInstance $topo \
-wiredRouting ON \
-agentTrace OFF \
-routerTrace OFF \
-macTrace OFF
#create base-station node
set temp {1.0.0 1.0.1 1.0.2 1.0.3} ;# hier address to be used for wireless
;# domain
set BS(0) [$ns_ node [lindex $temp 0]]
$BS(0) random-motion 0 ;# disable random motion
#provide some co-ord (fixed) to base station node
$BS(0) set X_ 1.0
$BS(0) set Y_ 2.0
$BS(0) set Z_ 0.0
#configure for mobilenodes
$ns_ node-config -wiredRouting OFF
for {set j 0} {$j < $opt(nn)} {incr j} {
set node_($j) [ $ns_ node [lindex $temp \
[expr $j+1]] ]
$node_($j) base-station [AddrParams addr2id \
[$BS(0) node-addr]]
}
#create links between wired and BS nodes
$ns_ duplex-link $W(0) $W(1) 5Mb 2ms DropTail
$ns_ duplex-link $W(1) $BS(0) 5Mb 2ms DropTail
$ns_ duplex-link-op $W(0) $W(1) orient down
$ns_ duplex-link-op $W(1) $BS(0) orient left-down
# setup TCP connections
set tcp1 [new Agent/TCP]
$tcp1 set class_ 2
set sink1 [new Agent/TCPSink]
$ns_ attach-agent $node_(0) $tcp1
$ns_ attach-agent $W(0) $sink1
$ns_ connect $tcp1 $sink1
set ftp1 [new Application/FTP]
$ftp1 attach-agent $tcp1
$ns_ at $opt(ftp1-start) "$ftp1 start"
set tcp2 [new Agent/TCP]
$tcp2 set class_ 2
set sink2 [new Agent/TCPSink]
$ns_ attach-agent $W(1) $tcp2
$ns_ attach-agent $node_(2) $sink2
$ns_ connect $tcp2 $sink2
set ftp2 [new Application/FTP]
$ftp2 attach-agent $tcp2
$ns_ at $opt(ftp2-start) "$ftp2 start"
# Tell all nodes when the simulation ends
for {set i } {$i < $opt(nn) } {incr i} {
$ns_ at $opt(stop).0 "$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_ tracefd namtrace
# $ns_ flush-trace
close $tracefd
close $namtrace
}
puts "Starting Simulation..."
$ns_ run
