Virtual Private Networks, Second Edition - O’Reilly

Historically, only large companies could afford secure networks, which
they created from expensive leased lines. Smaller folks had to make do
with the relatively untrusted Internet. Nowadays, even large companies
have to go outside their private nets, because so many people
telecommute or log in while they’re on the road. How do you provide a
low-cost, secure electronic network for your organization? The solution
is a virtual private network: a collection of technologies that creates
secure connections or “tunnels” over regular Internet
lines–connections that can be easily used by anybody logging in from
anywhere. A number of products now exist to help you develop that
solution. This book tells you how to plan and build a VPN. It starts
with general concerns like costs, configuration, and how a VPN fits in
with other networking technologies like firewalls. It continues with
detailed descriptions of how to install and use VPN technologies that
are available for Windows NT and Unix, such as PPTP and L2TP, Altavista
Tunnel, Cisco PIX, and the secure shell (SSH). New features in the
second edition include SSH, which is a popular VPN solution for Unix
systems, and an expanded description of the IPSec standard, for which
several vendors have announced support. Topics include:

• How the VPN compares to other available networking technologies
• Introduction to encryption, firewalls, the IPSec standard, and other technologies that let VPNs work
• Point to Point Tunneling Protocol (PPTP) and L2TP
• The Altavista Tunnel
• The Cisco PIX Firewall
• Secure Shell (SSH)
• Maintenance and troubleshooting

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