Re: [MMUSIC] WGLC on draft-ietf-mmusic-msrp-usage-data-channel-16

Paul Kyzivat <pkyzivat@alum.mit.edu> Sun, 10 May 2020 19:15 UTC

Return-Path: <pkyzivat@alum.mit.edu>
X-Original-To: mmusic@ietfa.amsl.com
Delivered-To: mmusic@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 95D683A0B27 for <mmusic@ietfa.amsl.com>; Sun, 10 May 2020 12:15:05 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -1.991
X-Spam-Level:
X-Spam-Status: No, score=-1.991 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_MSPIKE_H2=-0.001, T_SPF_PERMERROR=0.01] autolearn=ham autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=alum.mit.edu
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 vaLTbHhtlTOx for <mmusic@ietfa.amsl.com>; Sun, 10 May 2020 12:15:03 -0700 (PDT)
Received: from NAM12-DM6-obe.outbound.protection.outlook.com (mail-dm6nam12on2082.outbound.protection.outlook.com [40.107.243.82]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 412A13A0B26 for <mmusic@ietf.org>; Sun, 10 May 2020 12:15:03 -0700 (PDT)
ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=AKjJlvRo8xhXU1nTqARcCy5S8AGQGxEsgNUIZdFS+2TeQsQ8ZmKtt2q0Xo3DSaTWRfIvtsu12+ANF542q8oR38H4fVyUeVDQqNAzzx61mwCTPUBGOlS+d2pXvZBb89fe3WpsWNmcmmBELtCrzKo4Y3dyzrXkZZDwhxsF2I9/GL7fI6y6oFA8O+KACTDOaaVYNXE3Iy/2p7zHtUEQlawJrYRAYnmTg9vaPM5gK3OAF2TNCsohZGVo5Gsmebv7KTAPjJX+FWTjp52dsCtzRTydWGYWSFPM7zMQgDWwr83mhoOQy7SfZbH8GW4+RjLDOJhg1sL+ZWTd4MyB7Va+xYUZiA==
ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=03T9mzeAXz+m6rwPVA0PLPQZyROLUyNuVDCfHoYo0LE=; b=VW5jWopCdBpQFqJWkPexHQ0X67LrvpC3BZfOolCjJYmQOGfkFja+P256zXKk5IOgKCG7Y81l2MjMKPQqsdWWIisW0hpot7D84GWwLW/53YsfGPfgecFmcUUn1L67qqh6nPRKHrWGYENgHs2CT5ym8dzfdgAj4ehNfgYR/G+/XPlLnfFtLyAvEIBtrabg+munM15UgL3rz5mwVietTePgiiJieCGfC2eIeya++7sLTN74X4jTcLzd2cyquMsoxJN/lJGd3wkVvbaFpFoCZXe/4DfqUhFIH6g3GuJcifnjRGspU4E79atnMlBm/PglXfD/tZWIQ01FVY483RtyKpB9Jw==
ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=permerror (sender ip is 18.7.68.33) smtp.rcpttodomain=ietf.org smtp.mailfrom=alum.mit.edu; dmarc=none action=none header.from=alum.mit.edu; dkim=none (message not signed); arc=none
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alum.mit.edu; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=03T9mzeAXz+m6rwPVA0PLPQZyROLUyNuVDCfHoYo0LE=; b=XxDf22Cp5x/Ua5Jb+oQ4zBNIHd5abfpES4uvmNVIqjhT9Wgfk8QoCrGRAQESlcpDOdRKBuNH1QBQPEIJJiJ8XmxqUOSastW9hAlqqtHo4vmwbVOXNDQez8XdaK6+wjwCoEuJOZZX1LP+KWoC5Dbp7mPT/eDIsyf7LJJ2w0U7PAk=
Received: from CY4PR04CA0026.namprd04.prod.outlook.com (2603:10b6:903:c6::12) by DM5PR1201MB0044.namprd12.prod.outlook.com (2603:10b6:4:54::10) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2979.34; Sun, 10 May 2020 19:15:01 +0000
Received: from CY1NAM02FT034.eop-nam02.prod.protection.outlook.com (2603:10b6:903:c6:cafe::b8) by CY4PR04CA0026.outlook.office365.com (2603:10b6:903:c6::12) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2979.29 via Frontend Transport; Sun, 10 May 2020 19:15:01 +0000
Authentication-Results: spf=permerror (sender IP is 18.7.68.33) smtp.mailfrom=alum.mit.edu; ietf.org; dkim=none (message not signed) header.d=none;ietf.org; dmarc=none action=none header.from=alum.mit.edu;
Received-SPF: PermError (protection.outlook.com: domain of alum.mit.edu used an invalid SPF mechanism)
Received: from outgoing-alum.mit.edu (18.7.68.33) by CY1NAM02FT034.mail.protection.outlook.com (10.152.75.190) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2979.29 via Frontend Transport; Sun, 10 May 2020 19:15:00 +0000
Received: from Kokiri.localdomain (c-24-62-227-142.hsd1.ma.comcast.net [24.62.227.142]) (authenticated bits=0) (User authenticated as pkyzivat@ALUM.MIT.EDU) by outgoing-alum.mit.edu (8.14.7/8.12.4) with ESMTP id 04AJEw3J010969 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES128-SHA bits=128 verify=NOT) for <mmusic@ietf.org>; Sun, 10 May 2020 15:14:59 -0400
To: mmusic@ietf.org
References: <HE1PR07MB4426ADA1E4B1D696A48BA9A98DA40@HE1PR07MB4426.eurprd07.prod.outlook.com> <cb511151-af0d-a4d7-c82f-2191a7e88cd9@omnitor.se> <134665e3-0fba-f7c8-89d4-86951ed7fb29@ch3m4.com> <69f3e5d2-aba7-2bcd-0ed0-40ea9f5c121e@ghaccess.se> <AM7PR07MB701293DB525EE2BC6F7C953793A00@AM7PR07MB7012.eurprd07.prod.outlook.com>
From: Paul Kyzivat <pkyzivat@alum.mit.edu>
Message-ID: <85a2b11f-32c5-2848-0640-180c5441ebd8@alum.mit.edu>
Date: Sun, 10 May 2020 15:14:58 -0400
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:68.0) Gecko/20100101 Thunderbird/68.8.0
MIME-Version: 1.0
In-Reply-To: <AM7PR07MB701293DB525EE2BC6F7C953793A00@AM7PR07MB7012.eurprd07.prod.outlook.com>
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Language: en-US
Content-Transfer-Encoding: 8bit
X-EOPAttributedMessage: 0
X-Forefront-Antispam-Report: CIP:18.7.68.33; CTRY:US; LANG:en; SCL:1; SRV:; IPV:CAL; SFV:NSPM; H:outgoing-alum.mit.edu; PTR:outgoing-alum.mit.edu; CAT:NONE; SFTY:; SFS:(376002)(136003)(346002)(39860400002)(396003)(46966005)(33430700001)(33440700001)(82740400003)(186003)(53546011)(31696002)(86362001)(70206006)(70586007)(2906002)(7596003)(8676002)(26005)(31686004)(356005)(6916009)(478600001)(786003)(316002)(5660300002)(956004)(75432002)(82310400002)(8936002)(2616005)(336012)(36906005)(47076004)(43740500002); DIR:OUT; SFP:1101;
X-MS-PublicTrafficType: Email
X-MS-Office365-Filtering-Correlation-Id: 268ca645-5e44-4552-636e-08d7f5166f91
X-MS-TrafficTypeDiagnostic: DM5PR1201MB0044:
X-Microsoft-Antispam-PRVS: <DM5PR1201MB0044A2F8BAB698CC532716DEF9A00@DM5PR1201MB0044.namprd12.prod.outlook.com>
X-MS-Oob-TLC-OOBClassifiers: OLM:10000;
X-Forefront-PRVS: 039975700A
X-MS-Exchange-SenderADCheck: 1
X-Microsoft-Antispam: BCL:0;
X-Microsoft-Antispam-Message-Info: qX0aXWBrOArW4plsVYOCnpUs5JwQb03HLlivxQJUVHbig/YRSIAnx/5pOqCDdw1yQ2ZNycfrtlDChZvr21rUSwnRTVttchshJfkoSsDSHUC7PFN8ygjarGsgb9Ic87HEIPGW6PnUl5orMmoVfmAJ5Rk7Y8JJlL+LxJ96GFLZaek/ShwKU5xlogB2pDcWTvxmSKxaasPB3n/M6QpcxqsCwFK9EZeGswA5OiGqYOpSvSuLuTmNy9UsO/PFs91oz+E13trUHr56y0g5kCRzX+PmD8ZTgOReG5/uPSrJ8vEGWqIprUOxDAoT/s7w3xUGTARnRX0zyUGruQdszxKEqqyGUe/7LwD5BoqL73CmHcmgS0sNZ1vq1ItgtIdzefuiw6zNj6i8quxh4/DwUDbmiWdzXgl4wXi+j2Q0wYEnO4/eVkmK8mlHJkH+9xfB2xY0/M4QR3Q5pTAxO0m7/JwP/xmmzzZyTR0ep7MuzyhDJfXQG1FvI2xxpaiLV9jYG6RjV08AFuxj/H+SQURF6u5OcNXc8ZnsTXXHYnZifl+bvnYVqPxDHvWrIFDIoeVez3wN2VPWQov5Ese9SQQVGiRIWFbf//BatyCQTFIqyk3G+5frK4w=
X-OriginatorOrg: alum.mit.edu
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 May 2020 19:15:00.4290 (UTC)
X-MS-Exchange-CrossTenant-Network-Message-Id: 268ca645-5e44-4552-636e-08d7f5166f91
X-MS-Exchange-CrossTenant-Id: 3326b102-c043-408b-a990-b89e477d582f
X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3326b102-c043-408b-a990-b89e477d582f; Ip=[18.7.68.33]; Helo=[outgoing-alum.mit.edu]
X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem
X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR1201MB0044
Archived-At: <https://mailarchive.ietf.org/arch/msg/mmusic/PsxPAfZOj4zU3b86zfe2n3UFWUk>
Subject: Re: [MMUSIC] WGLC on draft-ietf-mmusic-msrp-usage-data-channel-16
X-BeenThere: mmusic@ietf.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Multiparty Multimedia Session Control Working Group <mmusic.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/mmusic>, <mailto:mmusic-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/mmusic/>
List-Post: <mailto:mmusic@ietf.org>
List-Help: <mailto:mmusic-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/mmusic>, <mailto:mmusic-request@ietf.org?subject=subscribe>
X-List-Received-Date: Sun, 10 May 2020 19:15:06 -0000

On 5/10/20 1:57 PM, Christer Holmberg wrote:

>  >>>1. Should the draft say that it updates RFC 4975?
>  >>>The msrps scheme is also IANA-registered in RFC 4975 section 15.5.2.
>  >>>Please check if that registration need update because of the reuse 
> of the msrps scheme.
>  >>
>  >>Thanks for bringing this back. WG was asked for feedback about 
> updating IANA registry or
>  >>keeping as it is, with the argument that data channel uses DTLS so it 
> would conform
>  >>original “msrps” requirement, that refers to TLS. There was no clear 
> outcome.
>  >>
>  >>If there are no comments opposing this, I would follow your comment 
> and add it to IANA updates section
> 
>  >Good.
> 
>  >Would it also be suitable to say that the draft updates RFC 4975, 
> because of this?
> 
> 
> I agree that a reference to the document should be added to the IANA 
> registry for the "msrps" scheme.
> 
> 
> And, if people think 4975 should be updated, I guess we could say 
> something like:
> 
> 
> "This document RFC 4975, by allowing the usage of the "msrps" scheme 
> when the underlying connection is protected with DTLS."

The key is ensuring that the required usage is clear and unambiguous. 
Specifically, ISTM that a "msrps" URI together with a "dc" parameter 
implies that connecting to this requires use of a data channel over a 
DTLS association established using the address in the URI.

Following up on that, a question about the example in 4.8:

The path attribute includes:

    msrps://bob.example.com:54111/si438dsaodes;dc

but the corresponding c= is:

    c=IN IP4 198.51.100.79

Am I to infer that =IN IP4 198.51.100.79 is the resolution of 
bob.example.com:54111? If so, why doesn't the c= reference 
bob.example.com:54111?

	Thanks,
	Paul