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VPNs Illustrated: Tunnels, VPNs, and IPsec Review by John Downing
Needs to be better organized
Given the complexity of VPN I was hoping to find a book that could explain key technologies in a concise and an organized manner. "VPNs Illustrated" does contain a wealth of technical information, but it failed on both counts.
The book offers unnecessary detail when trying to explain key concepts. It is so disjointed that the author is reduced to constantly referring the reader to other chapters to find information that is needed to understand a specific topic area. For example, the critical topic of IPSec is first introduced during a discussion of L2TP.
The book contains factual errors such as a typo describing "OC4" when the author meant to say OC48.
Overall, I was very disappointed with this text. It needs to be proofread and completely reorganized.