Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760745AbYBEUkR (ORCPT ); Tue, 5 Feb 2008 15:40:17 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1759178AbYBEUkD (ORCPT ); Tue, 5 Feb 2008 15:40:03 -0500 Received: from relay.2ka.mipt.ru ([194.85.82.65]:55758 "EHLO 2ka.mipt.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758234AbYBEUkA (ORCPT ); Tue, 5 Feb 2008 15:40:00 -0500 Date: Tue, 5 Feb 2008 23:39:11 +0300 From: Evgeniy Polyakov To: Andi Kleen Cc: Glenn Griffin , netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] Add IPv6 support to TCP SYN cookies Message-ID: <20080205203911.GA9891@2ka.mipt.ru> References: <47a79d64.16538c0a.5b6a.ffffb0fe@mx.google.com> <20080205155558.GA23145@one.firstfloor.org> <20080205200211.GA26150@one.firstfloor.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20080205200211.GA26150@one.firstfloor.org> User-Agent: Mutt/1.5.9i Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1063 Lines: 22 On Tue, Feb 05, 2008 at 09:02:11PM +0100, Andi Kleen (andi@firstfloor.org) wrote: > On Tue, Feb 05, 2008 at 10:29:28AM -0800, Glenn Griffin wrote: > > > Syncookies are discouraged these days. They disable too many > > > valuable TCP features (window scaling, SACK) and even without them > > > the kernel is usually strong enough to defend against syn floods > > > and systems have much more memory than they used to be. > > > > > > So I don't think it makes much sense to add more code to it, sorry. How does syncookies prevent windows from growing? Most (if not all) distributions have them enabled and window growing works just fine. Actually I do not see any reason why connection establishment handshake should prevent any run-time operations at all, even if it was setup during handshake. -- Evgeniy Polyakov -- 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/