IETF Logo Mail Archive

Re: [tsvwg] UDP Options: on forcing the use of UDP CS=0 in connection with FRAG+LITE

Tom Herbert <tom@herbertland.com> Tue, 02 July 2019 04:47 UTC

Return-Path: <tom@herbertland.com>
X-Original-To: tsvwg@ietfa.amsl.com
Delivered-To: tsvwg@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 99EDD1200E3 for <tsvwg@ietfa.amsl.com>; Mon, 1 Jul 2019 21:47:33 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -1.897
X-Spam-Level:
X-Spam-Status: No, score=-1.897 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_NONE=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=herbertland-com.20150623.gappssmtp.com
Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id o8GF5CpxSW2e for <tsvwg@ietfa.amsl.com>; Mon, 1 Jul 2019 21:47:31 -0700 (PDT)
Received: from mail-ed1-x544.google.com (mail-ed1-x544.google.com [IPv6:2a00:1450:4864:20::544]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 9968C1201E4 for <tsvwg@ietf.org>; Mon, 1 Jul 2019 21:47:31 -0700 (PDT)
Received: by mail-ed1-x544.google.com with SMTP id s49so26011532edb.1 for <tsvwg@ietf.org>; Mon, 01 Jul 2019 21:47:31 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=herbertland-com.20150623.gappssmtp.com; s=20150623; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=jrsTOA63JmJCPA4b+n0ihz3Pzkb2Y7sIgOmGWBWXWKk=; b=D+4/0GT/7luwh3HLzzDrCetOgQZR9F3niYyoB9JxDzbJJmNfyRV9QIVmmOWu+BsUqc b2Wu04EMKHM+xHTulNMENxN45scKmFQ/ObJdcwG0FVAawh9QvGZd0ENjCzdhl7I70cRv Ff+Rtd4by5pQBuvCT2U/h/cDk0iDR4qHwjvVd30pTWNjce9d+2WuqtASby4N4z/gEx7q Yp/vOEuOMjWglmguxt0IJ8dygN1Ya8R5IDILxXBL+UpUF01Y93z3nQxlrhpeuqCk9E3s 9wmlKZn1bCCQxsK+YJvS2kA6WiLYZGIK2ZxWqW+oI2zNwPldRB4zNI9Xp7TeM2UZ0nL7 D17A==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=jrsTOA63JmJCPA4b+n0ihz3Pzkb2Y7sIgOmGWBWXWKk=; b=HJ7IgwEAERfwqdIn/GS5swTegauaCJI5TGjkx9UfN5NrYBzUY4l5InW5/CJHijHkKQ yeCfPSlY1GTKUlM/H8Hwc6KWg92ZuLHRRJx092FcipOf3fTxpBwWHTM51SE48tfCAtOX aL1xLVyxev30FF2/meAVdT/WjwPUpxfELlpqolmwwXLp9+S4btlinLaq0yvNVJ9DZvzt jxln1HZyOMg5Vb43JQV1RDXk+K59iH3XDb3ad8ro3RBPU3ea0KPfnR3AePa5fIF/aadZ Q3RTEv+bYH+m+FwSDzhul/Um1JQFBCyA7AhCbh7r0XQtLKi0foqua8v78RlOe/tNPPdc rGgQ==
X-Gm-Message-State: APjAAAUtmM81qG9+snxbHdSc6b2VbyS8O3XZnEOmcwwBoU+FKOtZSscd upT6gYfRJ68lVESBdG8DAGafO+6evFUrpZK2d8N9sg==
X-Google-Smtp-Source: APXvYqzqBzsH/wk7T8NQgs1U/qhl62h5Kb+u5DaC3pf5aJ7R6JKkKc5g7AsKe9IgiKKaPCY+SLLiKpheGH3ArpxygPw=
X-Received: by 2002:a50:9646:: with SMTP id y64mr33482541eda.111.1562042850067; Mon, 01 Jul 2019 21:47:30 -0700 (PDT)
MIME-Version: 1.0
References: <CACL_3VHGtMz3htgfFLRGhjXm=qC7kOXQs+cchtamhh-giBnpLA@mail.gmail.com> <CALx6S35T9ApzMaoSVgHSJPpcpfXsbHHogoBbEjMPj6vH-kxYeA@mail.gmail.com> <CACL_3VE6kr33Vk5si5AxSZNmhqysZZGoy6HK37COUgwbvcRkdA@mail.gmail.com> <24692A9B-4AF1-4E32-A760-7D4908A61262@strayalpha.com> <CACL_3VExhAdFCu-kFLLO5DeRYUOFyJztUgJg-vQmnPoecvzeJg@mail.gmail.com> <CALx6S34zY74fhqbXxmiyturfu5mxFjRtA4=R48haX9tP6qLcow@mail.gmail.com> <A1C8FAD8-E189-410F-A6AD-D6F53E486BAE@strayalpha.com> <CALx6S342eWaXY4F_4fJxSpHSyVfGongbSVYoEZASOPS8rLAT6g@mail.gmail.com> <6A7811E6-9C7C-4BA6-B183-D03AE7100038@strayalpha.com> <CALx6S34kQ-ziqiSniqQeFTHvHb+4J6e6rKaURJW0ZJMo=q-h+Q@mail.gmail.com> <C81D0293-C287-49C3-A453-FED34C8E84FB@strayalpha.com> <CALx6S35XUKbLKTmh3r5Zk2eEe27_c3NH1T56_cF2uVihFVa8yQ@mail.gmail.com> <0AE80AEA-BA7A-4C08-8294-46EB00E5FA54@strayalpha.com>
In-Reply-To: <0AE80AEA-BA7A-4C08-8294-46EB00E5FA54@strayalpha.com>
From: Tom Herbert <tom@herbertland.com>
Date: Mon, 01 Jul 2019 21:47:18 -0700
Message-ID: <CALx6S36k=2ARh=DoRcKr9nRgjed7onWJRY78ysXROqcTAuYruQ@mail.gmail.com>
To: Joe Touch <touch@strayalpha.com>
Cc: "C. M. Heard" <heard@pobox.com>, tsvwg <tsvwg@ietf.org>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
Archived-At: <https://mailarchive.ietf.org/arch/msg/tsvwg/DYlMbyEGp8B7ywiXRDmeojHufiw>
Subject: Re: [tsvwg] UDP Options: on forcing the use of UDP CS=0 in connection with FRAG+LITE
X-BeenThere: tsvwg@ietf.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Transport Area Working Group <tsvwg.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/tsvwg>, <mailto:tsvwg-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/tsvwg/>
List-Post: <mailto:tsvwg@ietf.org>
List-Help: <mailto:tsvwg-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/tsvwg>, <mailto:tsvwg-request@ietf.org?subject=subscribe>
X-List-Received-Date: Tue, 02 Jul 2019 04:47:39 -0000

On Mon, Jul 1, 2019 at 8:40 PM Joe Touch <touch@strayalpha.com> wrote:
>
>
>
> On Jul 1, 2019, at 8:00 PM, Tom Herbert <tom@herbertland.com> wrote:
>
>> Yes. I find it ironic that you care so much to ensure that the checksum validates addresses and ports that nats change and here you’ve found a true error that you want to cover up instead of fix.
>
>
> What is the "true error" to which you're referring?
>
>
> Intermediate devices dropping cs=0.
>
Section 4.3 of RFC6935 is pertinent:

"Applicability Statement for the Use of IPv6 UDP Datagrams with Zero
Checksums" [RFC6936] specifies requirements for middleboxes and
tunnels that need to traverse middleboxes.  Tunnel protocols intending
to use a zero UDP checksum need to ensure that they have defined a
method for handling cases when a middlebox prevents the path between
the tunnel ingress and egress from supporting transmission of
datagrams with a zero UDP checksum.  This is especially important as
middleboxes that conform to RFC 2460 are likely to discard datagrams
with a zero UDP checksum."

> Joe

v2.23.0 | Report a Bug | By Email