Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. ClosedBSD was a derivative of FreeBSD aimed at providing firewall and Network Address Translation services, written by Joshua Bergeron. ClosedBSD aimed to be small in size, available as a floppy disk image at 1.4MB and as a CD-ROM ISO image at 12.8MB. Despite its small size, the software included a fully-functional ncurses-based interface. One of the advantages of ClosedBSD was the ability to run directly off a floppy disk or a CD-ROM, with no hard drive needed. It could also run on relatively old hardware; the diskette version needing a x86-based computer with 8MB of RAM, while the CD-ROM version needs 32MB of RAM.

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