Virtual Private Networks

Agenda

• What is a VPN?

• Characteristics of VPNs

• Types of VPNs?

VPN is

An emulation of a private Wide Area Network (WAN) using shared or public IP facilities, such as the Internet or private IP backbones

definition by IETF

• Encryption

• Authentication

• Authorization

• Data confidentiality

• Data integrity

• Sender non-repudiation

• Message authentication

Confidentiality and Authenticity in Encrypted Communications

Data Integrity, Secure Hashes

Message Authenticity and Data Non-Repudiation with Digital Signatures

VPN Tunneling Protocols

• IP Security (IPSec)

• Point-to-Point Tunneling Protocol (PPTP)

• Layer 2 Tunneling Protocol (L2TP)

• Secure Socket Tunneling Protocol (SSTP)

VPNs types:

• Site-to-site VPNs

• Remote access VPNs

Typical Site-to-Site VPN

There are two types of site-to-site VPN:

• Intranet VPNs— Allow connectivity between sites of a single organization

• Extranet VPNs— Allow connectivity between organizations such as business partners or a business and its customers

Remote Access VPNs

References

• Gupta, M. (2003) Building a Virtual Private Network

• Lewis, M. (2006) Comparing, Designing, and Deploying VPNs

• Carmouche, J. H. (2006) IPsec Virtual Private Network Fundamentals

Advantages of VPNs

• Reduced cost of implementation

• Reduced management and staffing costs

• Enhanced connectivity

• Security of transactions

• Effective use of bandwidth

• Enhanced scalability

Advantages of VPNs

• High dependence on the Internet

• Lack of support to the legacy protocols

Q & A

Thank You