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VPNs Leased Lines Protocols and Implementation

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					       Virtual Private Networks




By: Scott Ayers
    Stacey Bilodeau
    David Jordan
Transition From Leased Lines to VPNs

 Quick History Lesson.
 What is a VPN?
    Virtual
    Private
    Network
 Leased Line Network Versus VPN
      ANX
 Cost Comparison
    Example of a leased line network
                                                              Le
                                            ne                     as
                                       Li                               ed
                                  ed                Chicago                  Lin
                             as                                                    e
                        Le
                                                 Leased Line

          Los Angeles
                                                                                       New York

                             Private Network

•Leasing the lines 24 hours a day even though the line is not
used.
•If one line breaks there is no redundancy.
•Expensive to lease.
             Example of a VPN
                          Chicago



                              VPN
                             Tunnel

                 VP N    Public Network    VPN
                Tunnel
                                          Tunnel
                          (ATM / FR /
                            Internet)
        Los                                        New York
      Angeles
             Virtual Private Network
•It is a shared network and therefore the costs are shared.
•The costs associated to a VPN are less than a leased line.
•There is great redundancy.
                       Cost Comparison

                         Leased Line     Frame Relay VPN      Internet VPN


Annual Charges                $133,272            $89,998              $38,400


Installation                    $2,700             $5,760


Four VPN Appliances                               $16,000              $16,000


Total Cost, 1st Year          $135,972           $111,758              $54,400
                                              Prices are dated for the year 2000.
                      Protocols:

   PPTP(Point-to-               L2TP(Layer 2
    point tunneling               Tunneling
    protocol)                     Protocol)
     – Developed by many          – Combination of PPTP
       companies such as            and Cisco’s L2F
       Microsoft                  – Used for remote-access
     – Designed for remote-         and site-site
       access                     – Operates at layer 2
     – Operates at layer 2
                          Protocols:

   IPSec(Internet                      SOCKSv5 with
    Protocol Security)                   SSL-
     – Suite of protocols that           – SOCKSv5 is a standard for
       provide secure tunneling of         authenticating traffic across
       IP packets only                     firewalls
     – Use for site-to-site              – SOCKSv5 with SSL allows
     – Operates at Layer 3                 for the creation of a VPN
     – Integrated into IPv6                connection on any firewall
                                         – It controls data at Layer 5
    Advantages and Disadvantages

   Advantages:                     Disadvantages
     – Cost Savings                   – Uses the Internet
                                           Limited bandwidth
     – Scalability                         Single point of failure

            Uses the Internet             Security concerns
                                           No QoS
                                      – False Sense of Security
       False Sense of Security

 VPNs protect against eavesdropping and
  insertion attacks.
 VPNs do not protect against viruses or attacks
  being passed through the VPN tunnel.
               What do I need?

   Software
   Hardware
   Medium


               Concern
Scenario
               THANK YOU


This Presentation and accompanying Research Paper
can be viewed at the following website:


http://www.geocities.com/sbilode/DEVRY1.html

				
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posted:10/11/2012
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