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Re: [MMUSIC] connection:new with DTLS

Christer Holmberg <christer.holmberg@ericsson.com> Sun, 29 March 2015 22:17 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Bernard Aboba <bernard_aboba@hotmail.com>, Martin Thomson <martin.thomson@gmail.com>
Thread-Topic: [MMUSIC] connection:new with DTLS
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Date: Sun, 29 Mar 2015 22:17:39 +0000
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Subject: Re: [MMUSIC] connection:new with DTLS
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Hi,

-          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.

[BA]  If we are talking about DTLS *over* SCTP,  I don't see why re-establishment of the SCTP association should necessarily require a new DTLS association.  Why can't DTLS utilize SCTP as a "virtual connection" as it does ICE?

[CHH] Section 4.2 of RFC 6083 (which defines DTLS-over-SCTP) says:

        "Each DTLS connection MUST be established and terminated within the
        same SCTP association.  A DTLS connection MUST NOT span multiple SCTP
        associations."

I could not find any reason for that, but as at least two of the authors of that RFC should be reading this, perhaps they can explain :)


-          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.

[BA]  In general, transport layers are built to run over a variety of lower layers, and be tolerant of their (differing) characteristics.  So re-establishing the SCTP association does not impact an underlying DTLS association.

[CHH] Correct.


-          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.

[BA]  Don't believe everything you read on the InterWebs, even if it is on the IETF website :)

[CHH] Well, I read my own draft :) But, if we think there does not need to be an impact on the TCP connection, we can for sure change that.

Regards,

Christer

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