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).