I want to observe the queue scheduling inside the router node,here is the
complete picture:
FTP0
|
tcp0
|
n1
\ sink0
\ /
n2 - - - - - - - - - - -n3
/ \
/ sink1
n0
|
tcp1
|
ftp1
I want the packets to go through node 2 before they are sent by node 2 to
node 3, that means it will be one-hope away right? I set tcp agent and ftp
application in node 0 and node 1, as well as attached 2 tcpsink to
node 3.Imade node 3 out of the sensing range of the source nodes so
that i can make
sure that the packets from source node did not go directly to node 3.However,
after the simulation, they are not only didnt go directly to node 3 but also
not sent to node 2. Thats why I am wondering what is wrong with my
simulation.Do you know the situation?
Thanks for your help.
On 2/26/07, Matthias Kuhnert [EMAIL PROTECTED] wrote:
Hi,
do you have any traffic between source and sink at all?
If so, then they simply have a direct connection and communicate without
the other node. So then either put the nodes further away from each other,
or decrease the rx/tx range...
If not, you have a completely different problem and perhaps the nodes too
far apart from each other...
Greets,
Matthias
Original-Nachricht
Datum: Mon, 26 Feb 2007 21:51:04 +0800
Von: romzyi prasetyo [EMAIL PROTECTED]
An: ns milis ns-users@ISI.EDU
CC:
Betreff: [ns] need help on wireless simulation
hi all,
I am new in NS2. Currently I am doing wireless simulation which consists
of
4 nodes. 2 as the source nodes, 1 as a router, the other one as a sink
node.
I want to simulate such that when the source nodes generate packets, the
packets will be queued in relay node before they are sent to the sink
node.However,the problem is there is no packet received in node 2 .I
wonder
what has caused this error.I have made sure that the relay node is
located
pretty near to the source nodes, but still no packets received there.
Below is the code:
#
===
# PRIORITY-BASED DROPTAIL QUEUE SIMULATION#
#
===
# Scheme:
#
---
#n1(100,200,0)
# \
# n2(150,150,0) --- n3(500,150,0)
# /
#n0(100,100,0)
#
# ==
# 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) 10;# max packet in ifq
set val(nn) 4 ;# number of
mobilenodes
set val(rp) DSDV ;# routing protocol
set val(drate)2.0e6 ;# default
datarate
# ==
# Main Program
# ==
proc getopt {argc argv} {
global val
lappend optlist drate
for {set i 0} {$i $argc} {incr i} {
set arg [lindex $argv $i]
if {[string range $arg 0 0] != -} continue
set name [string range $arg 1 end]
set val($name) [lindex $argv [expr $i+1]]
}
}
getopt $argc $argv
# Initialize Global Variables
set ns_[new Simulator]
set tracefd [open fyp6.tr w]
#set tracefd0 [open fyp4_0.tr w]
#set tracefd1 [open fyp4_1.tr w]
#set cmt [cmu-trace Send RTR $tracefd]
$ns_ use-newtrace
$ns_ trace-all $tracefd
# set up topography object
set topo [new Topography]
$topo load_flatgrid 500 500
# Create God
create-god $val(nn)
set data0 0
set data1 0
# Parameter values
$val(mac) set dataRate_ $val(drate)
#$val(mac) set bandwidth_ 22.0e6
#$val(netif) set Pt_ 0.28
$val(netif) set bandwidth_ 2.0e6
# Create the specified number of mobilenodes [$val(nn)] and attach
them
# to the channel
# Here 4 nodes are created : node(0),node(1), node(2) and node(3)
# configure node
$ns_ node-config -adhocRouting $val(rp) \
-llType $val(ll) \
-macType $val(mac) \
-ifqType $val(ifq) \
-ifqLen $val
