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Re: [MMUSIC] DTLS-over-SCTP, anyone?

Christer Holmberg <christer.holmberg@ericsson.com> Mon, 08 February 2016 20:45 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Roman Shpount <roman@telurix.com>, "Schwarz, Albrecht (Nokia - DE)" <albrecht.schwarz@nokia.com>
Thread-Topic: [MMUSIC] DTLS-over-SCTP, anyone?
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Date: Mon, 08 Feb 2016 20:45:45 +0000
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Cc: mmusic <mmusic@ietf.org>
Subject: Re: [MMUSIC] DTLS-over-SCTP, anyone?
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Hi,

> The problem with DTLS-over-SCTP (RFC 6083) is that it is not fully compatible with draft-ietf-mmusic-dtls-sdp.
> In particular, RFC 6083 does not allow DTLS association span across multiple SCTP associations, but
> draft-ietf-mmusic-dtls-sdp allows to preserve DTLS association through a transport change. The most likely
> solution to this is updating RFC 6083, but, if no one is using DTLS-over-SCTP, it would be easier just to say
> that DTLS-over-SCTP is not supported.

*If* we decide to keep DTLS-over-SCTP in the draft, my suggestion would be to say that “DTLS preservation over transport change” does not apply to DTLS-over-SCTP, with a reference to RFC 6083.

Then, if someone at some point updates RFC 6083, the SCTP-SDP spec also has to be updated.

I do NOT want to delay draft-sctp-sdp until a possible RFC 6083 update has been done (assuming people would agree to do it in the first place).

Regards,

Christer


_____________
Roman Shpount

On Mon, Feb 8, 2016 at 10:12 AM, Schwarz, Albrecht (Nokia - DE) <albrecht.schwarz@nokia.com<mailto:albrecht.schwarz@nokia.com>> wrote:
Hello Christer,

the titel of the (future) RFC will not exclude any SCTP transport modes.
And a comprehensive and future safe protocol specification should cover all existing ones, which is “DTLS/SCTP/IP” as well as “SCTP/UDP/IP” (RFC 6951).
These two SCTP transport modes should be indicated as well, independent of potential intentions to be used soon.
Codepoint space could be reserved, placeholder sections tagged as “not yet supported” of “for further studies”, etc, but the worst case would be any kind of interaction issues in future.

My view,
Albrecht


From: mmusic [mailto:mmusic-bounces@ietf.org<mailto:mmusic-bounces@ietf.org>] On Behalf Of EXT Christer Holmberg
Sent: Montag, 8. Februar 2016 15:33
To: mmusic <mmusic@ietf.org<mailto:mmusic@ietf.org>>
Subject: [MMUSIC] DTLS-over-SCTP, anyone?

Hi,

draft-ietf-mmusic-sctp-sdp currently defines the SDP O/A procedures for SCTP, SCTP-over-DTLS, and DTLS-over-SCTP.

As we know, SCTP-over-DTLS is used for the WebRTC data channel.

My question is: does anyone intend to use DTLS-over-SCTP?

Regards,

Christer

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