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Re: [MMUSIC] connection:new with DTLS

Christer Holmberg <christer.holmberg@ericsson.com> Sun, 29 March 2015 08:34 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Martin Thomson <martin.thomson@gmail.com>
Thread-Topic: [MMUSIC] connection:new with DTLS
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Date: Sun, 29 Mar 2015 08:34:54 +0000
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Cc: "mmusic (E-mail)" <mmusic@ietf.org>
Subject: Re: [MMUSIC] connection:new with DTLS
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Hi,

SCTP has procedures for closing a session, which I assume will take place before the new one is established, so I don't think you would have the same demux issues. But, people with more implementation experience may have another view.

WHY someone wants to create a new connection I don't know. Similar reasons why someone would want to create a new TCP connection, I assume - whatever those reasons are :)

Regards,

Christer

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________________________________
From: Martin Thomson<mailto:martin.thomson@gmail.com>
Sent: ‎28/‎03/‎2015 21:27
To: Christer Holmberg<mailto:christer.holmberg@ericsson.com>
Cc: mmusic (E-mail)<mailto:mmusic@ietf.org>
Subject: Re: [MMUSIC] connection:new with DTLS


Why would you even want to make new connections/associations? I'm not as familiar with SCTP as DTLS, but I'd have to think that the same concerns with demux apply there.

On Mar 27, 2015 10:53 AM, "Christer Holmberg" <christer.holmberg@ericsson.com<mailto:christer.holmberg@ericsson.com>> wrote:
Hi,

As Justin mentioned during the 2nd MMUSIC session, RFC 5763 forbids usage of ‘connection:new’ for DTLS-SRTP.

However, draft-sctp-sdp DOES allow it.


-          In case of plain SCTP, there is no DTLS (and, there are no ICE procedures for SCTP transport), so that is fine.


-          In case of SCTP/DTLS, I guess re-establishment of the SCTP association would also impact the overlying DTLS association. But, again, there are no ICE procedures for SCTP transport, so that should be fine.


-          In case of UDP/DTLS/SCTP I guess one can re-establish the SCTP association without impacting the underlying DTLS connection, so that should be fine too.


-          However, in case of TCP/DTLS/SCTP, the draft says that connection:new re-establishes both the TCP connection and the SCTP association, so I guess that would impact the DTLS connection.


Regards,

Christer

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