Donnie Miles

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Virtual Private Network (VPN)

• Donnie Miles
• Holly Murray
• Kevin Osborn
• Wayne Roussel

March 15th, 2000
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Topics of Discussion

• What is VPN?
• Why use VPN?
• What are the elements of VPN?
• How does VPN work?
• How does VPN keep data secure?

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What is VPN?

• Virtual Private Network (VPN)
• Connects remote users who belong to a private
  network
• Allows private communications over a public
  network

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Who is using VPN technology?

• Perot Systems Corp.
• Switching to a VPN saved them 1,100/month
• DMR Consulting
• A VPN not only saves money but it also helps
  develop a team spirit

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Why use VPN?

• Remote access to the corporate network is
  required (individual users and business branches)
• Toll calls for connection are expensive
• The internet is public

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Why use VPN?

• Connectivity access can be gained from
  virtually anywhere
• Cost long distance charges and leased phone
  lines cost 1000s VPN can save 70-80
• Remote users feel like part of the company

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What are the elements of VPN?

• Server hardware/software
• Client hardware/software

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How does VPN work?

• Server VPN is configured to accept
  communications.
• Client initiates contact
• Server and Client connect and create a tunnel

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Tunneling
Tunneling is at the heart of all VPN
implementations. There are 2 generic classes of
tunnels

• End-to-End tunneling

• Node-to-Node tunneling

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End-to-End Tunneling

• Extends from a remote users PC to the server
  that it is connecting to
• The devices at each end of the connection must
  handle the establishment of the tunnels
• The devices must encrypt decrypt the data
  passed between the 2 points

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Node-to-Node Tunneling

• The tunnel terminates at the edge of the network.
  
• Could be used to connect LANs in different sites.
  
• The traffic on each LAN is unchanged.
• Once traffic passes through, it is encrypted
  tunneled to a similar device at the second site.
• It is then decrypted put onto the LAN

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Secure tunnels
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Tunneling Protocols

• IP Security (IPSec)
• Layer 2 Tunneling Protocol (L2TP)
• Point-to-Point Tunneling Protocol (PPTP)
• Proprietary Tunneling Protocols

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Point-to-Point Tunneling Protocol

• Most Widely used
• Microsoft supports it within Windows
• Many IT managers use it to test VPNs
• Typically used in end-to-end tunneling
  applications

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Layer 2 Tunneling Protocol

• Came out of a mix of the PPTP world a tunneling
  protocol-Layer 2 forwarding
• Developed by Cisco
• Frequently used in node-to-node applications

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IP Security

• Developed by the Internet Engineering Task Force
  to protect IP packets
• Commonly used in both end-to-end as well as
  node-to-node applications
• The automotive industry uses IPSec

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Proprietary Tunneling Protocols

• Trade-off
• Standards-based approaches offer some assurance
  of interoperability
• Proprietary approaches promise some performance
  enhancements
• Must use one vendors equipment

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How does VPN keep the data secure?

• Encryption
• Private Key
• Public Key
• Certificate
• Is encryption a friend or a foe?

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Remember somebody may be watching you!
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Sources

• Information Week Online Public Key
  Infrastructure Becomes E-Commerce Enabler by
  Larry Kahaner March 20, 2000
• What is VPN? www.rad.com/networks/1998/vpn/
• ZDNet A Modest Proposal by Ray Ozzie February
  13, 2001
• Internet Week VPN Implementation Calls For A
  Tunnel Trip by Salvatore Salamone December 14,
  1998

• The Shiva Company at www.europe.shiva.com
• Tina Bird at http//kubarb.phsx.ukans.edu/
• Baltimore Technologies at www.baltimore.com