From owner-freebsd-net  Wed Apr 17 12:57:12 2002
Delivered-To: freebsd-net@freebsd.org
Received: from mail-blue.research.att.com (mail-blue.research.att.com [135.207.30.102])
	by hub.freebsd.org (Postfix) with ESMTP id 3E3A237B404
	for <freebsd-net@FreeBSD.ORG>; Wed, 17 Apr 2002 12:57:05 -0700 (PDT)
Received: from alliance.research.att.com (alliance.research.att.com [135.207.26.26])
	by mail-blue.research.att.com (Postfix) with ESMTP
	id EDD4F4CEA8; Wed, 17 Apr 2002 15:57:00 -0400 (EDT)
Received: from windsor.research.att.com (windsor.research.att.com [135.207.26.46])
	by alliance.research.att.com (8.8.7/8.8.7) with ESMTP id PAA14290;
	Wed, 17 Apr 2002 15:57:00 -0400 (EDT)
From: Bill Fenner <fenner@research.att.com>
Received: (from fenner@localhost)
	by windsor.research.att.com (8.8.8+Sun/8.8.5) id MAA02194;
	Wed, 17 Apr 2002 12:56:59 -0700 (PDT)
Message-Id: <200204171956.MAA02194@windsor.research.att.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
To: silby@silby.com
Subject: Re: What does FreeBSD do when listen queue is full ?
Cc: freebsd-net@FreeBSD.ORG
Date: Wed, 17 Apr 2002 12:56:59 -0700
Versions: dmail (solaris) 2.4/makemail 2.9b
Sender: owner-freebsd-net@FreeBSD.ORG
Precedence: bulk
List-ID: <freebsd-net.FreeBSD.ORG>
List-Archive: <http://docs.freebsd.org/mail/> (Web Archive)
List-Help: <mailto:majordomo@FreeBSD.ORG?subject=help> (List Instructions)
List-Subscribe: <mailto:majordomo@FreeBSD.ORG?subject=subscribe%20freebsd-net>
List-Unsubscribe: <mailto:majordomo@FreeBSD.ORG?subject=unsubscribe%20freebsd-net>
X-Loop: FreeBSD.org


>We don't send a RST, we just silently drop the connection.

This is wrong too; it should silently drop the ACK and leave the
connection in the pending queue.

>However, at the point we're talking about,
>we're already past the 3-way handshake

I thought we were talking about the ACK that finished the 3-way handshake.

>I think that you're referring to the case where we receive an initial SYN,
>and the listen queue is full.

I'm referring to the case where the server has specified a backlog and
that backlog is full.  RST is never an appropriate response in this
condition, whether in response to the SYN or to the ACK of our SYN/ACK,
Microsoft's implementation notwithstanding.

  Bill

To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-net" in the body of the message