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VPN Basics

VPN Basics. By Kevin Stevens UAT NTS4150. VPN. Definition: A Virtual Private Network (VPN) is a technology that allows secure communication via a “tunnel,” across public networks. Types of VPN’s. Hardware – A dedicated appliance specifically for use as a VPN. -High performance

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VPN Basics

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  1. VPN Basics By Kevin Stevens UAT NTS4150

  2. VPN Definition: A Virtual Private Network (VPN) is a technology that allows secure communication via a “tunnel,” across public networks

  3. Types of VPN’s Hardware – A dedicated appliance specifically for use as a VPN. -High performance -Quick implementation for large scale deployment Examples: SonicWALL NSA E8500

  4. Types of VPN’s Software – Software based VPN that can be installed on existing infrastructure. -Lower capex (Possibly free) -Better compatibility with mixed environments Examples: OpenVPN, OpenSwan

  5. VPN Advantages • Cost efficient compared to dedicated lines • Ability to secure traffic through public networks • Faster deployment than other solutions

  6. VPN Disadvantages • No control over Internet bandwidth • Increase in network administration • Incompatibility issues • Can open remote vectors of attack

  7. VPN Configurations • Remote Access – establishes a remote connection on a client/server basis. Typically seen with telecommuters. • Network to network (site to site) – connects remote offices via end points.

  8. VPN Tunneling Protocols IPSec – Operates at the network layer. Provides functionality to encrypt and authenticate IP data. PPTP – Point-to-Point tunneling protocol. Operates at the Data link layer. Uses PPP to encapsulate data. L2TP – Layer 2 Tunneling Protocol. Operates at the Data link layer. Uses PPP to encapsulate data. A combination of L2F and PPTP. SSL – Works at different levels of the OSI, giving it flexibility.

  9. VPN Encryption Schemes VPN’s can be setup with a myriad of encryption schemes. Here are some of the basics: PPP – can provide encryption through Microsoft's Point-to-Point Encryption Protocol (MPPE). MPPE uses the RSA RC4 encryption algorithm. IPsec – provides encryption through the Encapsulating Security Payload (ESP). Supports various encryption algorithms. SSL/TLS – provides a variety of encryption algorithms.

  10. *Note* The Virtual Private Network Consortium only supports the following secure VPN technologies: • IPsec with encryption • L2TP inside of IPsec • SSL with encryption

  11. References Krutz L., R., & Vines, R. D. (2007). The CISSP and CAP Prep Guide. Indianapolis: Wiley Publishing. Merkow, M., & Breithaupt, J. (2006). Information Security Principles and Practice. Upper Saddle River: Prentice Hall. Northcutt, S., Zeltser, L., Winters, S., & Kent, K. R. (2005). Inside Network Security.Sams Publishing. VPN Technologies: Definitions and Requirements. (n.d.). Retrieved November 28, 2010, from http://www.vpnc.org/vpn-technologies.html

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