Steven Northcutt has put together a truly fascinating and helpful look at Network Security and Intrusion Detection. The book is littered with dozens of packet sequence examples and excellent narative which helps explain an often time difficult topic. I found the initial section on TCP/IP a welcome refresher, however those of you who have already read "TCP/IP Illustrated" will want to skip that portion entirely. After reading this book I really don't think you'll ever look at log files in the same light again.