Chapter 16. Remote Access Virtual Private Networks (VPNs)

This chapter covers the following topics:

  • VPN Basics

  • Authentication

  • Tunneling Protocols

  • Encryption

  • PGP

  • PKI

  • MD5

  • IPSec

  • IKE

  • LAN-to-LAN VPN

  • VPN Architecture

Remote access is best defined as providing access to fixed site resources for users who are not at a fixed workstation at that same site's Local Area Network (LAN). The largest remote access user community is mobile or telecommuting users, such as a sales force or field engineering team. Figure 16-1 illustrates a traditional remote access network using the Public Switched Telephone Network (PSTN) or the Integrated Services Digital Network (ISDN).

Figure 16-1. Traditional Remote Access (PSTN/ISDN Transport)

Figure 16-1. Figure ...

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