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Subject: [Bug 224730] ipfw dyn_keepalive sends a strange packet
Date: Wed, 10 Jan 2018 11:19:08 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D224730

Andrey V. Elsukov <ae@FreeBSD.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ae@FreeBSD.org

--- Comment #2 from Andrey V. Elsukov <ae@FreeBSD.org> ---
This packet is generated by ipfw(4) to cause remote host to send the reply,
that will extend lifetime of the STATE, created by keep-state rule. Since
stateful ipfw doesn't track TCP window, it doesn't set this field in the TCP
header. Also it doesn't set any TCP options.

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