In section 30.4.4. In-kernel NAT: "reassmabling" should be "reassembling"
I'll grab it. Thank you for the report.
A commit references this bug: Author: ale Date: Tue Apr 7 10:02:50 UTC 2020 New revision: 54041 URL: https://svnweb.freebsd.org/changeset/doc/54041 Log: Fix typo in IPFW page and s/reassamble/reassemble/g PR: 245396 Submitted by: wout@canodus.be Changes: head/en_US.ISO8859-1/books/handbook/firewalls/chapter.xml