This document discusses an NS-2 workshop. It begins by asking what NS-2 is and what is needed to use it. It explains that NS-2 is a network simulator and the requirements include installing NS-2, having a supported operating system like Ubuntu, development tools, and documentation. It also discusses how to program in NS-2 using TCL for simulations and other languages like C++, AWK, Python and Perl for processing output. The document provides examples of writing TCL code for creating nodes, links, agents and applications to simulate network traffic in NS-2.

1. NS-2 Workshop
Worasitipon Thomkort ( Instructor )

2. Overall
N S 2 - W o r k s h o p
What is NS2 ?
What we need ?
How to program ?
Let’s do it.

3. What we need ?
N S 2 - W o r k s h o p
System Environment
Document & Material
Tools & Developer kits
Yourself

4. What we need ?
N S 2 - W o r k s h o p
NS2
Ubuntu 13 or
above
( 2.35 support )
NS2.35
( last version )
Gcc
last
version
Recommended
System Environment

5. What we need ?
N S 2 - W o r k s h o p
Document & Manual
NS2 Document
NS2 Group /
Google
C++ (OOP) / Tcl

6. What we need ?
N S 2 - W o r k s h o p
Tools & Developer kits ( must )
Version control
• bitbucket
• github
• etc
Code Editor
• sublime text
• vim
• etc

7. Overall
N S 2 - W o r k s h o p
What is NS2 ?
What we need ?
How to program ?
Let’s do it.

8. How to Program ?
N S 2 - W o r k s h o p
How to program in NS2 ?
TCL
C++
For simulation
AWK
Python
Perl
output evaluation
1 2

9. How to Program ?
N S 2 - W o r k s h o p
TCL Coding Style in NS2
1 2 3
Create a global NS object
set ns [ new simulator ]
Create node
set n1 [ $ns node ]
Create links
$ns duplex-link $n1 $n2 10Mb 2ms DropTail
Define an output trace file
set tr [ open path/out.tr w ]
$ns trace-all $tr

10. How to Program ?
N S 2 - W o r k s h o p
TCL Coding Style in NS2
4
Create sender agents
Create receiver agents
Each application flow id
Link
ns2.35/tcl/lib/
ns-default.tcl
set udp [ new Agent/UDP ]
$ns attach-agent $n1 $udp
$udp set fid_ 1
set null [ new Agent/Null ]
$ns attach-agent $n2 $null
$ns connect $udp $null

11. How to Program ?
N S 2 - W o r k s h o p
TCL Coding Style in NS2
5
Create an application traffic
Link
ns2.35/tcl/lib/
ns-default.tcl
Each application flow id
set car [ new Application/CBR ]
$cbr set packetSize_ 160
$cbr set rate_ 10Mb
$cbr attach-agent $udp

12. How to Program ?
N S 2 - W o r k s h o p
How to create an application over
agents ?
N1 UD
1 2 3

13. How to Program ?
N S 2 - W o r k s h o p
TCL Coding Style in NS2
6
Create finish function & set simulation time
proc finish () {
global ns tr
$ns flush-trace
close $f
exit 0
}
$ns at 0 “cbr start”
$ns at 30 “cbr stop”
$ns run

14. How to Program ?
N S 2 - W o r k s h o p
AWK Coding Style in NS2
1 2 3
Define initial state
Define data filter
Show me at the final
begin {
i = 0;
}
{
event = $1
if ( event == “+” ) { }
}
end {
function();
print i;
}

15. How to Program ?
N S 2 - W o r k s h o p
Output Trace Files meaning
event time from to pkt type pkt size flag fid src des seq pid
+ 0 0 1 cbr 512 — 1 0 2 1 0
- 0 0 1 cbr 512 — 1 0 2 4 0
d 0.1 1 2 cbr 512 — 1 0 2 5 0
r 0.2 1 2 cbr 512 — 1 0 2 10 0