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Re: [MMUSIC] Fixing draft-holmberg-mmusic-sdp-dtls-00

Christer Holmberg <christer.holmberg@ericsson.com> Thu, 18 June 2015 05:27 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Roman Shpount <roman@telurix.com>, Martin Thomson <martin.thomson@gmail.com>
Thread-Topic: [MMUSIC] Fixing draft-holmberg-mmusic-sdp-dtls-00
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Date: Thu, 18 Jun 2015 05:27:31 +0000
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Subject: Re: [MMUSIC] Fixing draft-holmberg-mmusic-sdp-dtls-00
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Hi Martin,

Thanks for your feedback and suggestions!

Regards,

Christer

From: mmusic [mailto:mmusic-bounces@ietf.org] On Behalf Of Roman Shpount
Sent: 17. kesäkuuta 2015 23:04
To: Martin Thomson
Cc: mmusic@ietf.org
Subject: Re: [MMUSIC] Fixing draft-holmberg-mmusic-sdp-dtls-00

If you add that you also define an attribute to tell if remote party is performing ICE restart or setting up new ICE connection then you got it covered.

_____________
Roman Shpount

On Wed, Jun 17, 2015 at 2:10 PM, Martin Thomson <martin.thomson@gmail.com<mailto:martin.thomson@gmail.com>> wrote:
Some of the statements here are backwards.  For example,

   If an endpoint changes the local transport parameters associated with
   a DTLS association, the endpoint MUST create a new DTLS association.

I think that this document can be reduced to a series of conditionals:

If you change the endpoint that is participating (because forking, or
for any other reason), then you need a new DTLS association.
Otherwise, how will that new endpoint know what keys to use.

If you change the certificate you intend to use, then you need a new
DTLS association.  Otherwise, you don't get to send the new
certificate.

If you change the DTLS roles, then you need a new DTLS association.
Otherwise, it doesn't happen.

If you request a new DTLS association, then you need a new transport.
Otherwise, demux issues.

An ICE restart is not sufficient a change to constitute a new
transport.  You need entirely new IP+port pairs.

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