For news and updates about this book, check the book’s home page at the No Starch Press website (http://www.nostarch.com/pf2.htm). That page contains links to pages on my personal web space, where various updates and book-related resources will appear as they become available. I will post book-related news and updates at http://www.bsdly.net/bookofpf/. Announcements relevant to the book are likely to turn up via my blog at http://bsdly.blogspot.com/, too.

I maintain the tutorial manuscript “Firewalling with OpenBSD’s PF packet filter,” which is the forerunner of this book. My policy is to make updates when appropriate, usually as I become aware of changes or features of PF and related software and while preparing for appearances at conferences. The tutorial manuscript is available under a BSD license and can be downloaded in several formats from my web space at http://home.nuug.no/~peter/pf/.

Updated versions will appear at that URL more or less in the natural course of tinkering in between events.