[Bug 253476] ipfw keepalive: tcp_do_segment: Timestamp missing, segment silently dropped

From: <bugzilla-noreply_at_freebsd.org>
Date: Wed, 14 Jul 2021 07:46:10 UTC

--- Comment #15 from Michael Tuexen <tuexen@freebsd.org> ---
The default of the sysctl variable net.inet.tcp.tolerate_missing_ts has been
changed to accept packets violating the specification in FreeBSD main,
stable/13, and stable/12.

Please consider improving ipfw to not let endpoints look like as if they are
violating RFC 7223.

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