Hi all,
I was trying to simulate a multihop wireless network with a simple topology.
But it gives segmentation fault with AODV and DSR routing and works fine
with DSDV.
The script is simple and hence I am pasting the entire script. In short I
have 7 nodes (802.11 mac ) and 3 nodes send data to one particular node over
multiple hops.
I have the stack dump after the crash. But before going ahead and analyzing
it I would like to know if I am doing anything wrong here in the tcl file.
Any help would be highly appreciated.
Thanks
# ======================================================================
# Define options
# ======================================================================
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/SMAC ;# 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) 10 ;# max packet in ifq
set val(nn) 7 ;# number of mobilenodes
set val(rp) AODV ;# routing protocol
set dist(20m) 4.80696e-07
set dist(12m) 1.33527e-06
Phy/WirelessPhy set CSThresh_ $dist(12m)
Phy/WirelessPhy set RXThresh_ $dist(12m)
# ======================================================================
# Main Program
# ======================================================================
#
# Initialize Global Variables
#
set ns_ [new Simulator]
$ns_ color 1 Blue
$ns_ color 6 Red
$ns_ color 4 Green
$ns_ use-newtrace
set tracefd [open xms.tr w]
$ns_ trace-all $tracefd
# set up topography object
set topo [new Topography]
$topo load_flatgrid 500 500
#
# Create God
#
create-god $val(nn)
#
# Create the specified number of mobilenodes [$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) \
-channelType $val(chan) \
-topoInstance $topo \
-agentTrace ON \
-routerTrace ON \
-macTrace ON \
-movementTrace OFF
for {set i 0} {$i < $val(nn) } {incr i} {
set node_($i) [$ns_ node]
$node_($i) random-motion 0 ;# disable random motion
}
$node_(0) set X_ 20.0
$node_(0) set Y_ 25.0
$node_(0) set Z_ 0.0
$node_(1) set X_ 10.0
$node_(1) set Y_ 15.0
$node_(1) set Z_ 0.0
$node_(2) set X_ 20.0
$node_(2) set Y_ 35.0
$node_(2) set Z_ 0.0
$node_(3) set X_ 20.0
$node_(3) set Y_ 45.0
$node_(3) set Z_ 0.0
$node_(4) set X_ 30.0
$node_(4) set Y_ 15.0
$node_(4) set Z_ 0.0
$node_(5) set X_ 20.0
$node_(5) set Y_ 15.0
$node_(5) set Z_ 0.0
$node_(6) set X_ 20.0
$node_(6) set Y_ 5.0
$node_(6) set Z_ 0.0
# Setup node 1
set udp1 [new Agent/UDP]
$ns_ attach-agent $node_(1) $udp1
set cbr1 [new Application/Traffic/CBR]
$cbr1 set packetSize_ 500
$cbr1 set rate_ .01Mb
$cbr1 attach-agent $udp1
# Setup node 6
set udp6 [new Agent/UDP]
$ns_ attach-agent $node_(6) $udp6
set cbr6 [new Application/Traffic/CBR]
$cbr6 set packetSize_ 500
$cbr6 set rate_ .01Mb
$cbr6 attach-agent $udp6
# Setup node 4
set udp4 [new Agent/UDP]
$ns_ attach-agent $node_(4) $udp4
set cbr4 [new Application/Traffic/CBR]
$cbr4 set packetSize_ 390
$cbr4 set rate_ .02Mb
$cbr4 attach-agent $udp4
#setup the sink on node 3
set null [new Agent/Null]
$ns_ attach-agent $node_(3) $null
#connect the nodes
$ns_ connect $udp1 $null
$ns_ connect $udp6 $null
$ns_ connect $udp4 $null
#For marking
$udp1 set fid_ 1
$udp6 set fid_ 6
$udp4 set fid_ 4
#$ns_ at 10.0 "$cbr1 start"
#$ns_ at 11.0 "$cbr6 start"
$ns_ at 12.0 "$cbr4 start"
#$ns_ at 20.0 "$cbr1 stop"
#$ns_ at 21.0 "$cbr6 stop"
$ns_ at 22.0 "$cbr4 stop"
#
# Tell nodes when the simulation ends
#
for {set i 0} {$i < $val(nn) } {incr i} {
$ns_ at 30.0 "$node_($i) reset";
}
$ns_ at 30.0 "stop"
$ns_ at 30.01 "puts \"\" ; $ns_ halt"
proc stop {} {
global ns_ tracefd
$ns_ flush-trace
close $tracefd
}
puts "Starting Simulation..."
$ns_ run
The topology::
