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Subject: [Bug 224730] ipfw dyn_keepalive sends a strange packet
Date: Sun, 31 Dec 2017 00:21:47 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D224730

--- Comment #1 from hossy-fbsd@hossy.flnet.org ---
I used tcpdump's log from the production environment.
so, there is some difference between the reproduction process and log data.
but, there is no essential difference.

additionally, this strange packet causes counting up `completely duplicate
packets' in `netstat -s' instead of `duplicate acks'.

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