From mboxrd@z Thu Jan  1 00:00:00 1970
From: Doug McNaught <doug@mcnaught.org>
Subject: Re: question about linux tcp request queue handling
Date: 07 Jul 2003 18:25:17 -0400
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Cc: "Paul Albrecht" <palbrecht@qwest.net>, niv@us.ibm.com,
   linux-kernel@vger.kernel.org, "netdev" <netdev@oss.sgi.com>
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To: Andi Kleen <ak@suse.de>
In-Reply-To: Andi Kleen's message of "07 Jul 2003 23:48:10 +0200"
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List-Id: netdev.vger.kernel.org

Andi Kleen <ak@suse.de> writes:

> "Paul Albrecht" <palbrecht@qwest.net> writes:
> 
> > This statement is inconsistent with the description of this scenario in
> > Steven's TCP/IP Illustrated.  Specifically, continuing the handshake in the
> > TCP layer, i.e., sending a syn/ack and moving to the syn_recd state, is
> > incorrect if the limit of the server's socket backlog would be exceeded.
> > How do you account for this discrepancy between linux and other
> > berkeley-derived implementations?
> 
> The 4.4BSD-Lite code described in Stevens is long outdated. All modern
> BSDs (and probably most other Unixes too) do it in a similar way to what 
> Nivedita described. The keywords are "syn flood attack" and "DoS". 

And furthermore, IIRC, the current Linux networking code is not
Berkeley-derived, though an earlier version was.

-Doug