Peter N. M. Hansteen<p>We are still working on The Book of PF, 4th ed. </p><p>Preorders are open at <a href="https://nostarch.com/book-of-pf-4th-edition" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">nostarch.com/book-of-pf-4th-ed</span><span class="invisible">ition</span></a>, read about the work at <a href="https://nxdomain.no/~peter/yes_the_book_of_pf_4th_ed_is_coming.html" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">nxdomain.no/~peter/yes_the_boo</span><span class="invisible">k_of_pf_4th_ed_is_coming.html</span></a> (also tracked at <a href="https://bsdly.blogspot.com/2025/07/yes-book-of-pf-4th-edition-is-coming.html" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">bsdly.blogspot.com/2025/07/yes</span><span class="invisible">-book-of-pf-4th-edition-is-coming.html</span></a>) <a href="https://mastodon.social/tags/bookofpf" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>bookofpf</span></a> <a href="https://mastodon.social/tags/newedition" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>newedition</span></a> <a href="https://mastodon.social/tags/freebsdd" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>freebsdd</span></a> <a href="https://mastodon.social/tags/openbsd" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>openbsd</span></a> <a href="https://mastodon.social/tags/pf" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>pf</span></a> <a href="https://mastodon.social/tags/packetfilter" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>packetfilter</span></a> <a href="https://mastodon.social/tags/networking" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>networking</span></a> <a href="https://mastodon.social/tags/security" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>security</span></a> <a href="https://mastodon.social/tags/freesoftware" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>freesoftware</span></a> <a href="https://mastodon.social/tags/libresoftware" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>libresoftware</span></a></p>