Hi,
I'm new to ns2. I've been trying to simulate a wireless scenario in which a
mobile node sends data to another mobile node. I attached two udp agents
with node0 with cbr traffic for both of them. Then i attached two null
agents to node1 to receive the data. Both the agents are started at the same
time and made to run simultaneously. While I do so most of the packets get
dropped. Is there any problem if i attach two agents to a wireless node and
make them work at the same time?
The following is my tcl code:
# ======================================================================
# 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/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) DSR ;# routing protocol
set val(x) 300
;# X dimension of the topography in meters
set val(y) 300
;# Y dimension of the topography in meters
# =====================================================================
# Main Program
# ======================================================================
set ns [new Simulator]
$ns use-newtrace
set tf [open out.tr w]
$ns trace-all $tf
set nf [open out.nam w]
$ns namtrace-all-wireless $nf $val(x) $val(y)
set topo [new Topography]
$topo load_flatgrid $val(x) $val(y)
create-god $val(nn)
# 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 $topo \
-agentTrace ON \
-routerTrace ON \
-macTrace ON \
-movementTrace ON
set n0 [$ns node]
set n1 [$ns node]
$n0 set X_ 100.0
$n0 set Y_ 100.0
$n0 set Z_ 0.0
$n1 set X_ 200.0
$n1 set Y_ 100.0
$n1 set Z_ 0.0
$ns at 0.1 "$n0 setdest 50.0 100.0 0.5"
$ns at 0.1 "$n1 setdest 150.0 100.0 0.5"
set udp0 [new Agent/UDP]
$ns attach-agent $n0 $udp0
set cbr0 [new Application/Traffic/CBR]
$cbr0 set packetSize_ 500
$cbr0 set interval .005
$cbr0 attach-agent $udp0
set udp1 [new Agent/UDP]
$ns attach-agent $n0 $udp1
set cbr1 [new Application/Traffic/CBR]
$cbr1 set packetSize_ 500
$cbr1 set interval .005
$cbr1 attach-agent $udp1
set null0 [new Agent/Null]
$ns attach-agent $n1 $null0
set null1 [new Agent/Null]
$ns attach-agent $n1 $null1
$ns connect $udp0 $null0
$ns connect $udp1 $null1
$ns at 0.1 "$cbr0 start"
$ns at 0.1 "$cbr1 start"
$ns at 4.5 "$cbr0 stop"
$ns at 4.5 "$cbr1 stop"
$ns at 5.0 "finish"
proc finish {} {
global ns tf nf
$ns flush-trace
close $tf
close $nf
exec nam out.nam &
exit 0
}
$ns run
---------------------------------------------------------------------------
Please help.
Regards,
arun chekhov
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