Long rumored and eagerly anticipated by some, the fourth edition of The Book of PF is now available for preorder
More: 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), https://nostarch.com/book-of-pf-4th-edition @nostarch #openbsd #freebsd #pf #networking #bookofpf #freesoftware #firewalls