Hi all,
I have been trying to implement a very simple web caching example on a
simple wireless
topology. There are two nodes, one is the client and the other is the
server. The nodes doesn´t move
and they are in the coverage area of the other.
But it didnt work, though it worked fine when I used
a wired toplogy, or using the wireless toplogy with an FTP application,
below is the scrip I used.
I have tried using some rtproto sentences and disabling wired routing.
It seems to be an error with the FullTCPAgent. The client send a GET but
it never reach the server because
there is a problem with the ACKs but I don't know how to solve it.
I am using ns allinone 2.31
I would really appreciate any help,
Francisco
# ======================================================================
# 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) DSDV ;# routing protocol
# ======================================================================
# Main Program
# ======================================================================
#
# Initialize Global Variables
#
set ns [new Simulator]
set tracefd [open simple.tr w]
set log [open http.log w]
#$ns use-newtrace
$ns trace-all $tracefd
# set up topography object
set topo [new Topography]
$topo load_flatgrid 1500 300
#
# 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 OFF \
-movementTrace OFF
$ns node-config -wiredRouting OFF
for {set i 0} {$i < $val(nn) } {incr i} {
set node_($i) [$ns node]
$node_($i) random-motion 0 ;# disable random motion
}
#
# Provide initial (X,Y, for now Z=0) co-ordinates for mobilenodes
#
$node_(0) set X_ 0.0 ;#servidor
$node_(0) set Y_ 150.0
$node_(0) set Z_ 0.0
$node_(1) set X_ 10.0 ;#Cliente
$node_(1) set Y_ 150.0
$node_(1) set Z_ 0.0
#$ns rtproto Session
#Generador de páginas
set pgp [new PagePool/Math]
set tmp [new RandomVariable/Constant]
$tmp set val_ 1024 ;#Page size generator
$pgp ranvar-size $tmp
set tmp [new RandomVariable/Exponential]
$tmp set avg_ 5 ;#Page age generator
$pgp ranvar-age $tmp
set server [new Http/Server $ns $node_(0)] ;#Crea un servidor en el nodo0
$server set-page-generator $pgp
$server log $log
set client [new Http/Client $ns $node_(1)] ;#Crea un cliente en el nodo1
set tmp [new RandomVariable/Exponential]
$tmp set avg_ 5
$client set-interval-generator $tmp
$client set-page-generator $pgp
$client log $log
proc start-connection {} {
global ns server client
$client connect $server
$client start-session $server $server
}
proc finish {} {
global ns tracefd log
$ns flush-trace
flush $log
close $log
close $tracefd
exit 0
}
set starttime 1
set stoptime 50
$ns at $starttime "start-connection"
$ns at $stoptime "finish"
#
# Tell nodes when the simulation ends
#
for {set i 0} {$i < $val(nn) } {incr i} {
$ns at $stoptime "$node_($i) reset";
}
puts "Starting Simulation..."
$ns run
num_nodes is set 2
warning: Please use -channel as shown in tcl/ex/wireless-mitf.tcl
INITIALIZE THE LIST xListHead
Starting Simulation...
channel.cc:sendUp - Calc highestAntennaZ_ and distCST_
highestAntennaZ_ = 1.5, distCST_ = 550.0
SORTING LISTS ...DONE!
6.877574: FullTcpAgent::recv(_o59): bad ACK for our SYN: [3:0.0>1.0] (hlen:40,
dlen:20, seq:0, ack:21, flags:0x1a (<PSH,ACK,SYN>), salen:0, reason:0x0)
9.877710: FullTcpAgent::recv(_o59): bad ACK for our SYN: [6:0.0>1.0] (hlen:40,
dlen:20, seq:0, ack:21, flags:0x1a (<PSH,ACK,SYN>), salen:0, reason:0x4)
15.877190: FullTcpAgent::recv(_o59): bad ACK for our SYN: [13:0.0>1.0]
(hlen:40, dlen:20, seq:0, ack:21, flags:0x1a (<PSH,ACK,SYN>), salen:0,
reason:0x4)
27.877130: FullTcpAgent::recv(_o59): bad ACK for our SYN: [18:0.0>1.0]
(hlen:40, dlen:20, seq:0, ack:21, flags:0x1a (<PSH,ACK,SYN>), salen:0,
reason:0x4)
