Hello, everyone!
I am new in the ns world.Currently i am learning wireless routing.
I run a sample in chapter 9 (mobile networks) in "NS simulator for beginners".
The sample code is listed in pp. 117-118. When I set the routing protocol as
"DSDV", it finished simulation successfully. But when I modified the routing
protocol from "DSDV" to "DSR", it ran for a while and then quit with the
message "Segmentaion fault (core dump)".
Can anybody give me an advice or a clue?
Thanks in advance!!
My ns2 version is 2.29 all in one. I installed the ns on the cygwin platform.
The tcl code source is as follows.
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 ;# max packet in ifq
set val(nn) 3 ;# how many nodes are simulated
set val(adhocRouting) DSR
set val(x) 500 ;# X dimension of the topography
set val(y) 400 ;# Y dimension of the topography
set val(stop) 150.0 ;# simulation time
set ns_ [new Simulator]
# setup topography object
set topo [new Topography]
# create trace object for ns and nam
set tracefd [open wireless1-out.tr w]
set namtrace [open wireless1-out.nam w]
$ns_ trace-all $tracefd
$ns_ namtrace-all-wireless $namtrace $val(x) $val(y)
# define topology
$topo load_flatgrid $val(x) $val(y)
#
# Create God
#
set god_ [create-god $val(nn)]
#
# define how node should be created
#
#global node setting
$ns_ node-config -adhocRouting $val(adhocRouting) \
-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 $topo \
-agentTrace ON \
-routerTrace OFF \
-macTrace OFF
for {set i 0} {$i < $val(nn) } {incr i} {
set node_($i) [$ns_ node]
$node_($i) random-motion 0 ;# disable random motion
}
$node_(0) set X_ 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"
$ns_ at 15.0 "$node_(1) setdest 45.0 285.0 5.0"
$ns_ at 110.0 "$node_(0) setdest 480.0 300.0 5.0"
set tcp [new Agent/TCP/Newreno]
$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
$ns_ at 10.0 "$ftp start"
for {set i 0} {$i<$val(nn)} {incr i} {
$ns_ initial_node_pos $node_($i) 30
}
for {set i 0} {$i<$val(nn)} {incr i} {
$ns_ at $val(stop) "$node_($i) reset"
}
$ns_ at $val(stop) "$ns_ nam-end-wireless $val(stop)"
$ns_ at $val(stop) "stop"
$ns_ at 150.1 "puts \"end simulation \"; $ns_ halt"
proc stop {} {
global ns_ tracefd namtrace
$ns_ flush-trace
close $tracefd
close $namtrace
}
$ns_ run
xiongqing
2006-11-07
