Learn More from Books

    Design of 4.4BSD Operating System

        McKusick, Bostic, Carels, Quarterman

    Firewalls with Linux and OpenBSD

        Sonnenreich & Yates

    Building Internet Firewalls, 2e

        Elizabeth Zwicky, O'Reilly.

    Hacking Exposed

        McClure, Schambray, Kurtz

    UNIX System Administration, 2e

        Nemeth et al.

    See http://www.openbsd.org/books.html