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Date: Fri, 10 Jun 2005 15:42:48 -0700 (PDT)
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To: willy@w.ods.org
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       linux-kernel@vger.kernel.org
Subject: Re: BUG: Unusual TCP Connect() results.
From: "David S. Miller" <davem@davemloft.net>
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From: Willy TARREAU <willy@w.ods.org>
Date: Sat, 11 Jun 2005 00:26:45 +0200

> It is documented in RFC793 (p30) as the simultaneous connection initation
> from 2 clients, although this mode has never been implemented by any
> mainline OS (to my knowledge) as it has no real use and poses security
> problems (eases spoofing a lot).

BSD (and thus BSD derivatives) and Linux have has it since
day one.  I guess it depends upon your definition of
"mainline OS". :-)

This is not a new feature.