The latest Valuable News by @vermaden https://vermaden.wordpress.com/2025/12/08/valuable-news-2025-12-08/ notes that The Book of PF, 4th edition is coming soon (also https://nxdomain.no/~peter/yes_the_book_of_pf_4th_ed_is_coming.html, https://bsdly.blogspot.com/2025/07/yes-book-of-pf-4th-edition-is-coming.html) @nostarch #freebsd #openbsd #pf #packetfilter #bookofpf #4thedition