Báo cáo định kỳ lần 1

8/8/2019 Báo cáo định kỳ lần 1

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Periodical report no.1

Lecturer: Nguyn Trung Dng

Student: Nguyn Mnh Tú (NT)

Ngô c Vinh Quang

Trn Thành



Ni Dung

1 introduction

1.1 Ns2 overview

1.2 Nam1.3 Xgraph

1.4 Format of trace file

2 Simulation



1.1 NS2 overview (1)

NS is an object oriented simulator targeted at

networking research, written in C++.

NS provide support for networking researchand education:

± Protocol design, traffic studies, etc

± Protocol comparison

± New architecture design are also support




Ns 2 use two languages: C++ and Otcl.

± C++ faster to run but slower to change, => suitable

for detailed protocol implementation.

± Otcl slower to run but faster to change => suitable

for simulation configuration.




protocol/models supported

± Wired network

Routing: unicast, multicast, hierarchical routing, etc.

Transportation: TCP, UDP, others;

Traffic sources: web, ftp, telnet, cbr, etc.

Queuing disciplines: drop-tail, RED, etc.

Qos: intServ and Diffserv wireless networking ± Adhoc routing and mobile IP

± Sensor network

± Satellite network



1.2 Nam Network animator

Nam provides a visual interpretation of the

network topology created. It can be executed

directly from a TCL script.

Nam support:

± Provide darg and drop interface for creating

topologies.

± Control button include pause, play, stop, speed

controler.



1.3 xgraph - Graph plotting tool

Xgraph analyse trace files produces from ns2

to draw graph.

We use awk script to extract the necessaryinformation from frace file (.tr)

Xgraph can be called in tcl script



1.4 Format of trace file (1)

Format of trace file generated by NS

<event> <time> <from> <to> <pkt-type> <pkt-size> <flags> <fid> <src> <dst> <seq> <uid>

Trace example

+ 1 0 2 cbr 210 ------- 0 0.0 3.1 0 0

- 1 0 2 cbr 210 ------- 0 0.0 3.1 0 0

r 1.00234 0 2 cbr 210 ------- 0 0.0 3.1 0 0





1.4 Format of trace file (new format)

(3)

Next hop info: starts with a leading -H

-Hs: id of hop source; -Hd: id of hop destination

Packet info at Mac level: start with -M Packet info at IP level: start with -I

Packet info at application level: start with -P



2 simulation

topology

TCP

UDP



screenshot



Code tcl



Drop-CBR.awk script

BEGIN {numd=0;numr=0}

{

if (($1=="d")&&($4==3)&&($8==1)) { numd++; }

if (($1=="+")&&($3==1))

{ numr++;

print $2 " " numd/numr;}

}END{}



Drop-ftp.awk script

BEGIN {numd=0;numr=0}

{

if (($1=="d")&&($4==3)&&($8==2)) { numd++; }

if (($1=="+")&&($3==0))

{ numr++;

print $2 " " numd/numr;}

}END{}



Packet loss ratio graph



Next target

Principle of adhoc network

Simulation a simple adhoc network



Thank you for listening

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