Acknowledgments

Thanks to the FreeBSD developers who added and maintain IPFW.

Also, thanks to those who took the time to read early drafts of this document and offered many valuable comments and criticisms.

Attributions

Artwork from the following sources was used in preparing this book:

Original image: NGINX Logo

Obtained from Wikimedia https://en.wikipedia.org/wiki/Nginx#/media/File:Nginx_logo.svg. Image is listed as in the Public Domain.

The image was converted to .PNG and also to .BMP formats for use in this book and accompanying code. Conversions were accomplished via ImageMagick’s convert program.

Original image: BIND 9’s New Logo

Obtained from https://www.isc.org/blogs/bind-9s-new-logo/

Logo used with permission from Internet Systems Consortium (ISC).

The image was converted to .PNG and also to .BMP formats for use in this book and accompanying code. Conversions were accomplished via ImageMagick’s convert program.

Original image: World IPv6 Launch Logo

Obtained from Wikipedia: https://commons.wikimedia.org/wiki/File:World_IPv6_launch_logo.svg Original CC 3.0 license: https://creativecommons.org/licenses/by/3.0/deed.en Updated CC 4.0 license: https://creativecommons.org/licenses/by/4.0/deed.en

The image was converted to .PNG and also to .BMP formats for use in this book and accompanying code. Conversions were accomplished via ImageMagick’s convert program.

Use of the above artwork does not imply endorsement of any opinions expressed in this book.

All other artwork is orginial artwork by the author.