The Book of PF, 4th Edition: Now Available for Preorder

After eight years, the highly anticipated fourth edition of "The Book of PF" is now available for preorder! Author Peter Hansteen explains the update: to sync with the modern internet, particularly OpenBSD 7.8 and FreeBSD 14-STABLE. The new edition updates content while maintaining a similar structure and chapter titles, with a stronger FreeBSD focus. The update involved collaboration with Max Stucchi and Tom Smyth, refined through numerous conferences and tutorials. The fourth edition focuses on OpenBSD and FreeBSD's PF implementations and will be released in the second half of 2025, with a related tutorial at EuroBSDcon 2025.