Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S264851AbTGGVep (ORCPT ); Mon, 7 Jul 2003 17:34:45 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S264844AbTGGVeo (ORCPT ); Mon, 7 Jul 2003 17:34:44 -0400 Received: from ns.suse.de ([213.95.15.193]:55567 "EHLO Cantor.suse.de") by vger.kernel.org with ESMTP id S266276AbTGGVdh (ORCPT ); Mon, 7 Jul 2003 17:33:37 -0400 To: "Paul Albrecht" Cc: niv@us.ibm.com, linux-kernel@vger.kernel.org, "netdev" Subject: Re: question about linux tcp request queue handling References: <3F08858E.8000907@us.ibm.com.suse.lists.linux.kernel> <001a01c3441c$6fe111a0$6801a8c0@oemcomputer.suse.lists.linux.kernel> <3F08B7E2.7040208@us.ibm.com.suse.lists.linux.kernel> <000d01c3444f$e6439600$6801a8c0@oemcomputer.suse.lists.linux.kernel> <3F090A4F.10004@us.ibm.com.suse.lists.linux.kernel> <001401c344df$ccbc63c0$6801a8c0@oemcomputer.suse.lists.linux.kernel> From: Andi Kleen Date: 07 Jul 2003 23:48:10 +0200 In-Reply-To: <001401c344df$ccbc63c0$6801a8c0@oemcomputer.suse.lists.linux.kernel> Message-ID: User-Agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.2 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 915 Lines: 14 "Paul Albrecht" 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 The 4.4BSD-Lite code described in Stevens is long outdated.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". -Andi - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/