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Installation of ns3 in Ubuntu | Ubuntu 24.04 | ns-3.42

Telnet and FTP in Wired networks using NS2 (Network Simulator 2)

Telnet and FTP for a Wired Networks

This post tells about the use of Telnet and FTP in Network Simulator 2 for a wired network. This can be extended to a wireless network as well.

The following is the source code for implementing Telnet and FTP application in a Wired network scenario. 

The network looks like this:
Telnet
Telnet in NS2

Node 0 to Node 2 is enabled with Telnet Application and Node 1 to Node 3 is enabled with FTP Application.  Save the following file as wired.tcl
#===================================
#     Simulation parameters setup
#===================================
set val(stop)   10.0  ;# time of simulation end

#===================================
#        Initialization        
#===================================
#Create a ns simulator
set ns [new Simulator]

#Open the NS trace file
set tracefile [open out.tr w]
$ns trace-all $tracefile

#Open the NAM trace file
set namfile [open out.nam w]
$ns namtrace-all $namfile

#===================================
#        Nodes Definition        
#===================================
#Create 5 nodes
set n0 [$ns node]
set n1 [$ns node]
set n2 [$ns node]
set n3 [$ns node]
set n4 [$ns node]

#===================================
#        Links Definition        
#===================================
#Createlinks between nodes
$ns duplex-link $n0 $n4 100.0Mb 10ms DropTail
$ns queue-limit $n0 $n4 50
$ns duplex-link $n1 $n4 100.0Mb 10ms DropTail
$ns queue-limit $n1 $n4 50
$ns duplex-link $n2 $n4 100.0Mb 10ms DropTail
$ns queue-limit $n2 $n4 50
$ns duplex-link $n3 $n4 100.0Mb 10ms DropTail
$ns queue-limit $n3 $n4 50
$ns duplex-link $n3 $n0 100.0Mb 10ms DropTail
$ns queue-limit $n3 $n0 50

#        Agents Definition        
#===================================
#Setup a UDP connection
set tcp0 [new Agent/TCP]
$ns attach-agent $n0 $tcp0
set sink1 [new Agent/TCPSink]
$ns attach-agent $n2 $sink1
$ns connect $tcp0 $sink1

#Setup a UDP connection
set udp1 [new Agent/UDP]
$ns attach-agent $n1 $udp1
set null3 [new Agent/Null]
$ns attach-agent $n3 $null3
$ns connect $udp1 $null3
$udp1 set packetSize_ 1500


#===================================
#        Applications Definition        
#===================================
#Setup a FTP Application over TCP connection
set ftp1 [new Application/FTP]
$ftp1 attach-agent $tcp0
$ns at 1.0 "$ftp1 start"
$ns at 10.0 "$ftp1 stop"

#Setup a Telnet Application over UDP connection
set telnet0 [new Application/Telnet]
$telnet0 set interval_ 0.001
$telnet0 attach-agent $udp1
$ns at 1.0 "$telnet0 start"
$ns at 10.0 "$telnet0 stop"
#$ns at 10.0 "$cbr1 stop"
$telnet0 set type_ Telnet

#===================================
#        Termination        
#===================================
#Define a 'finish' procedure
proc finish {} {
    global ns tracefile namfile
    $ns flush-trace
    close $tracefile
    close $namfile
    exec nam out.nam &
    exit 0
}
$ns at $val(stop) "$ns nam-end-wireless $val(stop)"
$ns at $val(stop) "finish"
$ns at $val(stop) "puts \"done\" ; $ns halt"
$ns run

When you run the above file using the command 
$ ns wired.tcl 
and the output generated is out.nam and out.tr 
The packet transmission is shown like this in the animation window:
Telnet in NS2
Telnet in ns2


Node 0 to Node 2 is enabled with Telnet Application and Node 1 to Node 3 is enabled with FTP Application, which is shown in the above picture.
To get the throughput of the above file in bits per second, here is the awk script: 
Save the following in a file called telnet.awk  and store in the same place where the wired.tcl is also stored. 

BEGIN {
numTCP1=0;
tcpSize1=0;
numTCP2=0;
tcpSize2=0;
totaltcp1=0;
totaltcp2=0;
}
{
event=$1;
pkttype= $5;
fromnode=$9;
tonode=$10;
pktsize=$6;
if(event == "r" &&pkttype == "udp" &&fromnode == "1.0" &&tonode == "3.0")
{
numTCP1++;
tcpSize1 = pktsize;
}
if(event == "r" &&pkttype == "tcp" &&fromnode == "0.0" &&tonode == "2.0")
{
numTCP2++;
tcpSize2 = pktsize;

}

}

END {
totaltcp1=numTCP1*tcpSize1*8;
totaltcp2=numTCP2*tcpSize2*8;
throughputtcp1= totaltcp1/24; # because simulation time is 24.5   0.5 = 24
throughputtcp2= totaltcp2/24; # because simulation time is 24.5   0.5 = 24
printf("The Throughput of FTP application is %d \n", throughputtcp1);
printf("The Throughput of TELNET application is %d \n", throughputtcp2);
}
The above file can be run using the command:
$ gawk -f telnet.awk out.tr
The above command will print the following two lines which informs the throughput of using Telnet and FTP
The Throughput of FTP application is 8962000 
The Throughput of TELNET application is 3058293 

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