Re: [MMUSIC] Bundling data channel and RTP?
Christer Holmberg <christer.holmberg@ericsson.com> Tue, 26 May 2015 00:50 UTC
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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Paul Kyzivat <pkyzivat@alum.mit.edu>, "mmusic@ietf.org" <mmusic@ietf.org>
Thread-Topic: [MMUSIC] Bundling data channel and RTP?
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Date: Tue, 26 May 2015 00:50:01 +0000
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Subject: Re: [MMUSIC] Bundling data channel and RTP?
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Hi, >> I wonder whether we should have a "DTLS considerations" section in >> BUNDLE, and specify that all bundled media MUST use the same DTLS >> connection for key management, encryption etc. > > Yes, that makes sense. > >> Would it even be possible to establish multiple DTLS connections on a single 5-tuple? > > I don't think so. > > Note that RTP is "special" in this regard, in that it uses DTLS for the keying, but > it doesn't use DTLS payload packets. > > If there were more than one m-line that used DTLS payload packets then they > would also have to specify how to multiplex among them. AFAIK there is currently > no way to do that, so there can only be one m-line that uses DTLS payload packets. This is covered in section 9. Section 9.2 contains the following statement: "[RFC5764] does not describe how to identify different protocols transported on DTLS, only how to identify the DTLS protocol itself. If multiple protocols are transported on DTLS, there MUST exist a specification describing a mechanism for identifying each individual protocol. In addition, if a received DTLS packet can be associated with more than one "m=" line, there MUST exist a specification which describes a mechanism for associating the received DTLS packet with the correct "m=" line." Regards, Christer > -----Original Message----- > From: mmusic [mailto:mmusic-bounces@ietf.org] On Behalf Of Christian > Groves > Sent: 22 May 2015 10:20 > To: mmusic@ietf.org > Subject: Re: [MMUSIC] Bundling data channel and RTP? > > Hello Magnus and Martin, > > Thanks for confirming that. > > It would be good to cover bundling the SRTP and DTLS/SCTP m-lines the BUNDLE and JSEP drafts. > > Regards, Christian > > > > On 20 May 2015 at 17:21, Christian Groves<Christian.Groves@nteczone.com> wrote: > >> Can anyone confirm the intention that a single DTLS connection is >> used for SRTP key exchange and also SCTP packets? > > Yes, the record layer carries SCTP and exporters from the same session are used to key SRTP. > > > > On 21/05/2015 7:34 PM, Magnus Westerlund wrote: >> Christian Groves skrev den 2015-05-21 02:21: >>> Can anyone confirm the intention that a single DTLS connection is >>> used for SRTP key exchange and also SCTP packets? >>> >>> draft-ietf-rtcweb-transports-08 indicates: >>> >>> /WebRTC implementations MUST support multiplexing of DTLS and RTP over// >>> // the same port pair, as described in the DTLS_SRTP specification// >>> // [RFC5764], section 5.1.2. All application layer protocol >>> payloads// >>> // over this DTLS connection are SCTP packets./ >>> >>> To me this implies a single DTLS connection. However in RFC5764 >>> clause >>> 4.1 it says: >>> /Once the "use_srtp" extension is negotiated, the RTP or RTCP// >>> // application data is protected solely using SRTP. Application >>> data is// >>> // never sent in DTLS record-layer "application_data" packets. >>> Rather,// >>> // complete RTP or RTCP packets are passed to the DTLS stack, which// >>> // passes them to the SRTP stack, which protects them appropriately.// >>> / >>> In the second sentence "application data" is not qualified with "RTP >>> or RTCP" so it could be taken that its not possible to use the DTLS >>> connection for anything else. However I take it that as the rest of >>> the paragraph talks about RTP or RTCP that these were meant when >>> application data is mentioned? >>> >>> Can only one add some clarity? >>> >> >> Yes, that is clearly the intention as I understand it in WebRTC. >> >> Cheers >> >> Magnus Westerlund >> >> --------------------------------------------------------------------- >> - Services, Media and Network features, Ericsson Research EAB/TXM >> ---------------------------------------------------------------------- >> Ericsson AB | Phone +46 10 7148287 >> Färögatan 6 | Mobile +46 73 0949079 >> SE-164 80 Stockholm, Sweden | mailto: magnus.westerlund@ericsson.com >> --------------------------------------------------------------------- >> - >> >> > > _______________________________________________ > mmusic mailing list > mmusic@ietf.org > https://www.ietf.org/mailman/listinfo/mmusic > > _______________________________________________ > mmusic mailing list > mmusic@ietf.org > https://www.ietf.org/mailman/listinfo/mmusic > _______________________________________________ mmusic mailing list mmusic@ietf.org https://www.ietf.org/mailman/listinfo/mmusic
- [MMUSIC] Bundling data channel and RTP? Christian Groves
- Re: [MMUSIC] Bundling data channel and RTP? Christian Groves
- Re: [MMUSIC] Bundling data channel and RTP? Magnus Westerlund
- Re: [MMUSIC] Bundling data channel and RTP? Martin Thomson
- Re: [MMUSIC] Bundling data channel and RTP? Christian Groves
- Re: [MMUSIC] Bundling data channel and RTP? Christer Holmberg
- Re: [MMUSIC] Bundling data channel and RTP? Paul Kyzivat
- Re: [MMUSIC] Bundling data channel and RTP? Christer Holmberg
- Re: [MMUSIC] Bundling data channel and RTP? Paul Kyzivat