Advisor : Prof. Nader Mir

Co-Advisor : Prof. Chang Choo

By,

Devang Doshi (005746754)

Maulik Gandhi (006204692)

Abstract

Introduction

Architecture

Results and Analysis

Conclusion

Need for higher scalable networks with

better switching ability.

Advantages of MPLS networks

Simulation of MPLS and IP networks

Comparison and analysis of the results

Communication between different sites of a company

Need for security of the data

Disadvantages of the leased lines

Costly

Wastage of Bandwidth

Advantages of Virtual Private Networks

Cost Effective as the data is transferred over internet

Data Security with use of Authorization, Authentication and Encryption

Bandwidth Utilization

Replication of Private WAN over internet.

VPN extends the private intranet over

internet with the help of tunneling.

Tunneling[1][2]

Disadvantages

Not scalable

Designing and operating virtual backbone for every

customer is labor-extensive

Amount of configurations changes required when a

new site is added.[3][4]

Type of tunneling protocol MPLS

Scalable

Designing and operating the edge routers is much

more simpler

Amount of configurations changes required when

a new site is added is less.

Use of labels

Experimental field is used for QoS

If S=0 current label is not the last label

TTL is the maximum time allowed for a label in the network

Stack of labels used for hierarchical tunneling[5]

Identify the neighbors

Assignment of FEC by upstream LSR

Request for labels by upstream LSR

Receive the label and construct the

forwarding table

Advantages

Scalability

Security

Speed

Selecting the scalable VPN

Design a network model with

parameters

Network simulation tool

Generate the results and analysis of

results

Represent in graphical plots

Link delay = 10 ms;

Link BW = 3 Mb;

Burst time = 3 Sec;

Idle rate = 2 Sec;

Traffic rate = 2/1Mb/s;

Data packet size = 100B, 300B, 500B, 800B,

1000B, 3000B, 6000B.

No. of Sending node = 2;

Simulation time = 40 Sec;

OMNet++

Opnet

NS2

NS2

Written in C++/Otcl/Tcl

Can be mounted on Windows, Unix,

Free BSD, Linux

Mostly used for the simulation of routing

protocols, multicasting and ad-hoc

networkinng

Supports wired as well as wireless

communication

Xgraph generated with the help of delay

trace files of MPLS and IP networks.

MPLS IPv4

Selection of network simulator

Installation of NS2

Simulation using NS2

Writing AWK scripts

MPLS VPN better then IPv4 network in terms of Min, Max Avg delay, throughput and packet loss.

MPLS VPN is scalable, efficient in terms of CPU usage and BW usage.

Successfully concludes project with NS2 results and analysis.

Learning various VPNs, MPLS VPN, NS2, Tcl scripts, AWK Scripts and IEEE papers.

1. J. Snader, “VPNs Illustrated: Tunnels, VPNs, and IPsec”. Addison-Wesley, 2006 page 250-360

2. M. Gupta, “Building a Virtual Private Network”. Ohio: Premeir Press, 2003

3. N. F. Mir, “Computer and Communication Networks.” Prentice Hall, 2006

4. B. Davie and Y. Rekhter, “MPLS Technology and Applications”. Morgan Kaufmann Publisher, 2000 , Pages 211 – 244

5. E. Rosen and Y. Rekhter. (2010, October 28) “BGP/MPLS VPNs”. Online. Available: http://www.rfc-editor.org/rfc/rfc2547.txt Pages 2-5 (2010, January 30) “Advantages of VPN”. Online Available:http://www.vpn-info.com/advantages_of_vpn.htm