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(Virtual Private Network (VPN
 

(Virtual Private Network (VPN

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  • A Virtual Private Network is a private connection over an open network. This could mean encrypting traffic as it passes over a frame relay circuit, but the term is most commonly used to describe a method of sending information privately between two points across the Internet or other IP-based network. It enables organizations to quickly set up confidential communications to branch sites, remote workers, or to business partners in a cost effective way. To accomplish this, a VPN needs to have a standard way of encrypting data and ensuring the the identities of all parties. There are four basic types of deployment that VPNs are use for: Remote Access, Site-to-Site, Extranet, and Client/Server. We’ll look at each in more detail.
  • As VPNs become more common, the question is, “Why move from these other technologies?” There are three main reasons: Flexibility, Scalability, and Cost. The first benefit we’ll look at is the flexibility offered by VPNs. Because they use the existing connections to the Internet, rather than specialized connections between points or phone lines, they provide organizations with geographical flexibility. Major ISPs have points of presence in most large metropolitan areas, and can support connections for branch offices. Also, because
  • ROI Calculations: Configurations used to calculate the ROI are described below, and are conservative: they are biased towards the frame relay solution. ROI and pricing are based on Q2 promotional bundled pricing for the End-to-End Security Package. Site-to-site : VPN-1 solution has 5 sites have DSL-to-Internet connections, with a T1 Internet connection at HQ. Traditional solution has 5 sites connected to HQ with 64K CIR / 128 port speed connections, with a T1 Internet connection at HQ. The traditional configuration provides for a conservative comparison as it does not provide for link redundancy. Remote Access : VPN-1 solution has 200 remote access users with unlimited access consumer dial-up @ $20/month. The Traditional solution has 200 remote access users who average 2 hours/per day, 56K/64K dial-up @ .10/minute Support: For VPN-1, pricing includes a Software Subscription but not Platinum, Gold or Silver Support. The traditional pricing does not include support. Scenario Validation is provided within a 2001 Datamonitor Report: Secure Remote Access Solutions: Profiting from the VPN opportunity. Site-to-site : Secure Intranets allow companies to link branch offices to their central IT resource… SMEs, however, would not be measuring VPNs against leased lines, which would not be economically viable. To the SME, VPN technology offers the first affordable and secure broadband, when coupled with DSL or cable access. Remote access: Remote access applications…connect home workers and traveling executives or sales staff with their central IT resource. The cost savings are particularly clear when comparing the cost of dialing in to a local ISP and making long-distance calls to a central office in another part of the country. Although remote access penetration rates are high… 70% of remote users are traveling executives or members of the sales force. Currently, 60% of all remote access services are accessed by simple dial-up modems compared to only 3% by DSL. A great opportunity for remote access solution vendors will come when the number of home workers using remote access solutions increases…Currently, the simple 56k modem remains the most popular option by far, as it presents the cheapest alternative.

(Virtual Private Network (VPN (Virtual Private Network (VPN Presentation Transcript

  • Virtual Private Network (VPN)
    • “ If saving money is wrong, I don’t want to be right…”
    • - William Shartner
  • outline
    • What is a VPN?
      • Types of VPN
      • Why use VPNs?
      • Disadvantage of VPN
      • Types of VPN protocols
      • Encryption
  • What is a VPN?
    • A VPN is A network that uses Internet or other network service to transmit data.
    • A VPN includes authentication and encryption to protect data integrity and confidentiality
    Internet VPN VPN
  • Types of VPNs
    • Remote Access VPN
      • Provides access to internal corporate network over the Internet.
      • Reduces long distance, modem bank, and technical support costs.
    Internet Corporate Site
  • Types of VPNs
    • Remote Access VPN
    • Site-to-Site VPN
      • Connects multiple offices over Internet
      • Reduces dependencies on frame relay and leased lines
    Internet Branch Office Corporate Site
  • Types of VPNs
    • Remote Access VPN
    • Site-to-Site VPN
      • Extranet VPN
        • Provides business partners access to critical information (leads, sales tools, etc)
        • Reduces transaction and operational costs
    Corporate Site Internet Partner #1 Partner #2
  • Types of VPNs
    • Remote Access VPN
    • Site-to-Site VPN
      • Extranet VPN
      • Intranet VPN:
    • Links corporate headquarters, remote offices, and branch offices over a shared infrastructure using dedicated connections.
    Internet LAN clients Database Server LAN clients with sensitive data
  • Why Use Virtual Private Networks?
    • More flexibility
      • Use multiple connection types (cable, DSL, T1, T3)
      • Secure and low-cost way to link
      • Ubiquitous ISP services
      • Easier E-commerce
  • Why Use Virtual Private Networks?
    • More flexibility
    • More scalability
      • Add new sites, users quickly
      • Scale bandwidth to meet demand
  • Why Use Virtual Private Networks?
    • More flexibility
    • More scalability
    • Lower costs
      • Reduced frame relay/leased line costs
      • Reduced long distance
      • Reduced equipment costs (modem banks,CSU/DSUs)
      • Reduced technical training and support
  • VPN Return on Investment
    • 5 branch offices, 1 large corporate office, 200 remote access users.
    • Payback: 1.04 months. Annual Savings: 88%
    Case History – Professional Services Company Check Point VPN Solution Non-VPN Solution Savings with Check Point Startup Costs (Hardware and Software) $51,965 Existing; sunk costs = $0 Site-to-Site Annual Cost $30,485 $71,664 Frame relay $41,180 /yr RAS Annual Cost $48,000 $604,800 Dial-in costs $556,800 /yr Combined Annual Cost $78,485 $676,464 $597,980 /yr
  • Disadvantages of VPN
    • Lower bandwidth available compared to dial-in line
    • Inconsistent remote access performance due to changes in Internet connectivity
    • No entrance into the network if the Internet connection is broken
  • Point-to-Point Tunneling Protocol (PPTP)
    • Layer 2 remote access VPN distributed with Windows product family
      • Addition to Point-to-Point Protocol (PPP)
      • Allows multiple Layer 3 Protocols
    • Uses proprietary authentication and encryption
    • Limited user management and scalability
      • Used MPPE encryption method
    Remote PPTP Client ISP Remote Access Switch PPTP RAS Server Corporate Network Internet
  • Layer 2 Tunneling Protocol (L2TP)
    • Layer 2 remote access VPN protocol
      • Combines and extends PPTP and L2F (Cisco supported protocol)
      • Weak authentication and encryption
      • Addition to Point-to-Point Protocol (PPP)
      • Must be combined with IPSec for enterprise-level security
    Remote L2TP Client ISP L2TP Concentrator L2TP Server Corporate Network Internet
  • Internet Protocol Security (IPSec)
    • Layer 3 protocol for remote access, intranet, and extranet VPNs
      • Internet standard for VPNs
      • Provides flexible encryption and message authentication/integrity
  • Encryption
    • Used to convert data to a secret code for transmission over an trusted network
    Encryption Algorithm “ The cow jumped over the moon” “ 4hsd4e3mjvd3sd a1d38esdf2w4d” Clear Text Encrypted Text
  • Symmetric Encryption
    • Same key used to encrypt and decrypt message
    • Faster than asymmetric encryption
    • Used by IPSec to encrypt actual message data
    • Examples: DES, 3DES, RC5
    Shared Secret Key
  • Asymmetric Encryption
    • Different keys used to encrypt and decrypt message (One public, one private)
    • Provides non-repudiation of message or message integrity
    • Examples include RSA, DSA, SHA-1, MD-5
    Alice Public Key Encrypt Alice Private Key Decrypt Bob Alice
  • Industries That May Use a VPN
    • Healthcare : enables the transferring of confidential patient information within the medical facilities & health care provider
    • Manufacturing : allow suppliers to view inventory & allow clients to purchase online safely
    • Retail : able to securely transfer sales data or customer info between stores & the headquarters
    • Banking/Financial : enables account information to be transferred safely within departments & branches
    • General Business : communication between remote employees can be securely exchanged
  • Some Businesses using a VPN
    • CVS Pharmaceutical Corporation upgraded their frame relay network to an IP VPN
    • Bacardi & Co. Implemented a 21-country, 44-location VPN
  • Questions
    • presented by :
    • Iman Abooee
    • Thanks for your attention
    • Winter 85
  • Resource:
    • www.vpnc.org/vpn-technologies.pdf
    • www.adtran.com/
    • www.cisco.com/ipsec_wp.htm
    • www.computerworld.com
    • www.findvpn.com
    • www. Shabake_mag.com