From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Mon, 29 Jan 2001 02:38:20 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Mon, 29 Jan 2001 02:38:10 -0500 Received: from zeus.kernel.org ([209.10.41.242]:57031 "EHLO zeus.kernel.org") by vger.kernel.org with ESMTP id ; Mon, 29 Jan 2001 02:38:00 -0500 From: "David S. Miller" MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <14965.7321.926528.391631@pizda.ninka.net> Date: Sun, 28 Jan 2001 23:32:41 -0800 (PST) To: James Sutherland Cc: Miquel van Smoorenburg , linux-kernel@vger.kernel.org Subject: Re: ECN: Clearing the air (fwd) In-Reply-To: In-Reply-To: <951am4$gbf$1@ncc1701.cistron.net> X-Mailer: VM 6.75 under 21.1 (patch 13) "Crater Lake" XEmacs Lucid Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org James Sutherland writes: > Except you can detect and deal with these "PMTU black holes". Just as you > should detect and deal with ECN black holes. Maybe an ideal Internet > wouldn't have them, but this one does. If you can find an ideal Internet, > go code for it: until then, stick with the real one. It's all we've got. Guess what, Linux works not around PMTU black holes either for the same exact reason we will not work around ECN. I'm getting a bit tired of you, and I suppose others are as well. You are being nothing but a pompous ass. Anyways, let me quote a comment from the Linux source code where we would have done PMTU black hole detection: /* NOTE. draft-ietf-tcpimpl-pmtud-01.txt requires pmtu black hole detection. :-( It is place to make it. It is not made. I do not want to make it. It is disguisting. It does not work in any case. Let me to cite the same draft, which requires for us to implement this: "The one security concern raised by this memo is that ICMP black holes are often caused by over-zealous security administrators who block all ICMP messages. It is vitally important that those who design and deploy security systems understand the impact of strict filtering on upper-layer protocols. The safest web site in the world is worthless if most TCP implementations cannot transfer data from it. It would be far nicer to have all of the black holes fixed rather than fixing all of the TCP implementations." Golden words :-). */ Later, David S. Miller davem@redhat.com - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/