PStefanov wrote: » I just wanted to share the name of what I believe is a great book for IPSec: Cisco Press 2006 - IPSec Virtual Private Network Fundamentals I first started reading Cisco Press 2005 - IPSec VPN Design, but had a lot of confusion about some of the stuff and then switched to the aforementioned book. Very few are the books that are easily readable and you don't need to go back and reread again. This book is one of them. Very good engineers are probably the authors of most books, but not all of them are as good as writers. I was having a discussion with my brother, and we agreed that like 50% of the book's value is its ability to be read easily without much need to reference external materials or go over the same things again and again until you get what the author wanted to say. What do you think?