[Bug 224730] ipfw dyn_keepalive sends a strange packet

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=224730

--- Comment #3 from hossy-fbsd at hossy.flnet.org ---
All right, you say this packet is a expected behavior.

BTW, `netstat -s' shows this packet as `completely duplicate packets'.
If this packet is for keep-alive, I want `netstat -s' to count up `duplicate
acks'.
Because ACK only packet for normal keep-alive is counted as `duplicate acks'.
And I'm understanding `completely duplicate packets' is for analyzing for TCP
packet retransmitted.

This is a implementation mismatch between ipfw and kern.tcp, isn't it?

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