OpenBSD, the elegant, highly secure Unix-like operating system, is widely used as the basis for critical DNS servers, routers, firewalls, and more. But it can be even trickier to use than either Unix or Linux, and even harder to master. From Michael W. Lucas, author of Absolute FreeBSD, Network Flow Analysis, Cisco Routers for the Desperate, and PGP & GPG, comes the long-awaited revision of the classic guide to OpenBSD. This straightforward and practical guide is for the experienced UNIX user who wants to add OpenBSD to his or her repertoire. Lucas takes you through the intricacies of the platform, offering thorough explanations, technical background, best practices, and copious humor throughout. Absolute OpenBSD, 2nd Edition is completely updated to cover OpenBSD 5.3 and includes new coverage of OpenBSD's boot system, security features like W^X and ProPolice, and advanced networking techniques. Whether you're a new user looking for a complete introduction to OpenBSD, or an experienced sysadmin looking for a refresher, Absolute OpenBSD, 2nd Edition will give you everything you need to master the world's most secure operating system.