Silvia Hagen’s 3d edition of IPv6 Essentials is a thorough presentation of the IPv6 landscape. It starts with inviting reasons to dive into IPv6 despite many of us not perceiving pressure to make the transition. I found the book samples promising and I am glad that I bought the book. “IPv6 Essentials” is not a casual read but a tremendous resource. I did read through it as a book but it’s like a textbook (only a lot less expensive). It is intended to serve as a reference as well as a guide to the subject to, while readable, it is filled with RFC references. It is not a series of tutorials on cranking up IPv6 services but a deep and broad survey of the subject, the RFC’s, and related materials. It is NOT a regurgitation or reprint of RFC’s but a thorough analysis and presentation.
Every chapter gets into RFC’s related to that topic, be it “Why IPv6,” IPv6 Addressing,” “The Structure of the IPv6 Protocol,” “Security with IPv6,” for example, and each is peppered with RFC and other references. The book is worth money for just the chapter-by-chapter topical collection of related RFC’s at end of each chapter--but it provides so much more. There is a very thorough explanation of the basics, of what happens on the wire, with examples of network captures/protocol analysis, throughout the book. The approach gives you insight on which you can build. There are many explanations of the various v4 to v6 transition problems. Security problems are highlighted throughout the book.
I found myself re-creating her packet captures and getting used to seeing the new structures—and thoroughly understanding the context based on her detailed documentation of how IPv6 works. I have, after doing so, and seeing how much IPv6 is already flowing, developed a sense of urgency. I have a new perspective. We are vulnerable to IPv6 issues even if we are not “officially” transitioning. It’s everywhere, basically an out-of-band network that we’re all running without necessarily seeing it.
There are references to Security issues throughout the book as well as the chapter dedicated to the subject. You get many insights into areas for concern, weaknesses that we can’t leave behind with IPv4, as well as new challenges with IPv6—but no hesitation to proceed. She addresses the benefits of dropping NAT for the ability to see the client and makes good arguments for working around our NAT mentality to look at Security from other perspectives. Does NAT really do that much for your security? It’s not like NAT helps a whole lot in our egress concerns. It’s not like NAT helps when the intellectual property can leave at the application layer. How much easier would many issues be without NAT? We already have to take deeper and stronger approaches to host-based protections and she stresses a new Security model tied more to identity and directories than to IP addresses.
It is going to take eons before we see the last of IPv4 but IPv6 transition is inevitable. This book provides extensive details on the transition technologies as well as the reasons to move forward. You already have IPv6 running somewhere (like all your Windows and Linux systems …and quite possibly your tablets and phones) and you already have vulnerabilities related to running both stacks even if your ISP does not offer IPv6. You might as well understand the transition issues and the existing IPv6 traffic. Get used to breaking the new picture down. Develop plans to analyze, document, isolate, …protect based on understanding IPv6. The detailed breakdowns of the issues, the RFC references, the byte-by-byte explanations of what happens under the hood are packed into “IPv6 Essentials.”
The book is a challenge but it is worth it, especially for Security engineers, consultants, and developers who need to understand what is going on at the byte-level. Ms. Hagen explains the issues, ties in the RFCs, diagrams the structure of the packets and extensions, provides examples of network captures and protocol analysis, and provides the insight that you need to continue on your own.
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