Re: Presentation for a call if DTLS Association be started if not requested in the offer

Hi,

>The relevant text is here https://tools.ietf.org/html/draft-ietf-rtcweb-jsep-23#section-5.8.3
>
>         tls-id value, which MUST be set according to
>         [I-D.ietf-mmusic-dtls-sdp], Section 5.  If this is a re-offer
>         and the tls-id value is different from that presently in use,
>         the DTLS connection is not being continued and the remote
>         description MUST be part of an ICE restart, together with new
>         ufrag and password values.  If this is an answer, the tls-id
>         value, if present, MUST be the same as in the offer.
>
> This is no longer precisely correct because you've made the answerer provide its own tls-id,
> but the clear implication is that the answerer cannot unilaterally restart DTLS. It's when
> we went to update it to handle the newer syntax, we found the conflict.

It’s true that the answerer provides its own tls-id, but I don’t understand why that would imply that it can’t restart DTLS.

Also, I’d like to hear your suggestion on how to handle backward compatibility with endpoints that don’t support tls-id (read: endpoints that may trigger new DTLS association in the answer). Maybe the problem will go away one day, but I don’t think we can just close our eyes and wait for that day to come…

Regards,

Christer



On Thu, Sep 28, 2017 at 11:14 AM, Roman Shpount <[email protected]<mailto:[email protected]>> wrote:
Hi All,

I would also like to see if and how exactly allowing new DTLS association when not requested in the offer, contradicts JSEP.

Roman Shpount


On Sep 28, 2017 02:22, "Christer Holmberg" <[email protected]<mailto:[email protected]>> wrote:
Thanks Roman!

I would request those that do NOT want to allow an answerer to trigger a new DTLS association to prepare a description (verbally or using slides) on how they suggest handling interoperability with legacy peers that may trigger a new DTLS association in the answer.

Regards,

Christer

From: Roman Shpount <[email protected]<mailto:[email protected]>>
Date: Thursday 28 September 2017 at 08:37
To: Christer Holmberg <[email protected]<mailto:[email protected]>>, "[email protected]<mailto:[email protected]>" <[email protected]<mailto:[email protected]>>, Ben Campbell <[email protected]<mailto:[email protected]>>, Bernard Aboba <[email protected]<mailto:[email protected]>>, Bo Burman <[email protected]<mailto:[email protected]>>, Eric Rescorla <[email protected]<mailto:[email protected]>>, Flemming Andreasen <[email protected]<mailto:[email protected]>>, Jonathan Lennox <[email protected]<mailto:[email protected]>>, Justin Uberti <[email protected]<mailto:[email protected]>>, "[email protected]<mailto:[email protected]>" <[email protected]<mailto:[email protected]>>, "[email protected]<mailto:[email protected]>" <[email protected]<mailto:[email protected]>>
Subject: Presentation for a call if DTLS Association be started if not requested in the offer

Hi All,

Attached is the presentation for the call tomorrow (or later today)

Once again, conference call information:

Join the meeting: join.me/112-807-485<https://join.me/112-807-485>

Thursday, September 28, 2017 12:00 PM
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Regards,

_____________

Roman Shpount

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