Re: [MMUSIC] Mirja Kühlewind's Discuss on draft-ietf-mmusic-sctp-sdp-23: (with DISCUSS)

"Mirja Kuehlewind (IETF)" <ietf@kuehlewind.net> Thu, 16 February 2017 14:56 UTC

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From: "Mirja Kuehlewind (IETF)" <ietf@kuehlewind.net>
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Date: Thu, 16 Feb 2017 15:56:48 +0100
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To: Christer Holmberg <christer.holmberg@ericsson.com>
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Subject: Re: [MMUSIC] =?utf-8?q?Mirja_K=C3=BChlewind=27s_Discuss_on_draft-ietf?= =?utf-8?q?-mmusic-sctp-sdp-23=3A_=28with_DISCUSS=29?=
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Hi,

> Am 16.02.2017 um 15:37 schrieb Christer Holmberg <christer.holmberg@ericsson.com>om>:
> 
> Hi Mirja,
> 
> ...
> 
> ----------------------------------------------------------------------
> DISCUSS:
> ----------------------------------------------------------------------
> 
>> Why is this using TCP/DTLS/SCTP instead of TCP/TLS/SCTP?	
> 
> Because the way it is realized is by transporting SCTP on top of DTLS (as defined in draft-ietf-tsvwg-sctp-dtls-encaps) and transporting DTLS on top of TCP (defined in RFC 4571).

I got this but DTLS is a mapping to use TLS with UDP because UDP is an unreliable datagram transport. If you use TCP, you should use TLS. And rfc4571 is not a mapping of DTLS to TCP.

Mirja


> 
> Regards.
> 
> Christer
> 
> 
> 
>