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Subject: [Bug 214630] netstat displays spurious count for connections in
 LAST_ACK state inside jail with VIMAGE kernel
Date: Wed, 23 Nov 2016 10:59:32 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D214630

--- Comment #5 from tony181116@outlook.com ---
Created attachment 177326
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=3D177326&action=
=3Dedit
Showing duplicate fin packets


On further investigation I have noticed duplicate FIN packets being created,
although due to the set up of the machine this may or may not be helpful as=
 the
packets are manipulated by:

1) ipfw to send them to
2) a divert socket which is used to add a GTP header to the packet.
3) back into the firewall for final dispatch to gateway.

Although it did occur to me if these additional fin packets are being count=
ed
before the UDP header is added, then it would be possible to end up with a
negative number of connections in some TCP states.

--=20
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