Re: [MMUSIC] Bundling data channel and RTP? - Text proposal
Paul Kyzivat <pkyzivat@alum.mit.edu> Mon, 25 May 2015 16:22 UTC
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Date: Mon, 25 May 2015 12:22:12 -0400
From: Paul Kyzivat <pkyzivat@alum.mit.edu>
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Subject: Re: [MMUSIC] Bundling data channel and RTP? - Text proposal
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On 5/25/15 3:14 AM, Christer Holmberg wrote: > Hi, > > Below is a suggestion for a "DTLS considerations" section. Let me know if you think there are more rules/restrictions that we should document. My reply to your other message implies that it is probably important to say more than this. Also, I *think* it is possible to mix RTP over UDP with RTP over DTLS in the same bundle. (Though I can't think of any utility to doing so.) I don't think what you say below is inconsistent with that, but it might be good to think through the implications. Thanks, Paul > -------------------- > > X. DTLS Considerations > > One or more media streams within a BUNDLE group can use > the Datagram Transport Layer Security (DTLS) protocol [RFC6347] > in order to encrypt the data, or to negotiate encryption keys > if another encryption mechanism is used to encrypt media. > > When DTLS is used for more than one media stream within a BUNDLE > group, the following rules apply: > > o A single DTLS association [RFC6347] MUST be used for all media > using DTLS; and > > o Each media protocol using DTLS MUST use the same mechanism for > determining which endpoint (the offerer or answerer) becomes DTLS client and DTLS server. > > -------------------- > > Regards, > > Christer > > > > -----Original Message----- > From: mmusic [mailto:mmusic-bounces@ietf.org] On Behalf Of Christer Holmberg > Sent: 25 May 2015 04:59 > To: Christian Groves; mmusic@ietf.org > Subject: Re: [MMUSIC] Bundling data channel and RTP? > > 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. > > Would it even be possible to establish multiple DTLS connections on a single 5-tuple? > > 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 >
- Re: [MMUSIC] Bundling data channel and RTP? - Tex… Christer Holmberg
- Re: [MMUSIC] Bundling data channel and RTP? - Tex… Paul Kyzivat
- Re: [MMUSIC] Bundling data channel and RTP? - Tex… Christian Groves
- Re: [MMUSIC] Bundling data channel and RTP? - Tex… Christer Holmberg
- Re: [MMUSIC] Bundling data channel and RTP? - Tex… Makaraju, Maridi Raju (Raju)
- Re: [MMUSIC] Bundling data channel and RTP? - Tex… Roman Shpount
- Re: [MMUSIC] Bundling data channel and RTP? - Tex… Christer Holmberg
- Re: [MMUSIC] Bundling data channel and RTP? - Tex… Christian Groves
- Re: [MMUSIC] Bundling data channel and RTP? - Tex… Roman Shpount
- Re: [MMUSIC] Bundling data channel and RTP? - Tex… Christer Holmberg
- Re: [MMUSIC] Bundling data channel and RTP? - Tex… GUBALLA, JENS (JENS)
- Re: [MMUSIC] Bundling data channel and RTP? - Tex… Roman Shpount
- Re: [MMUSIC] Bundling data channel and RTP? - Tex… Roman Shpount
- Re: [MMUSIC] Bundling data channel and RTP? - Tex… Martin Thomson
- Re: [MMUSIC] Bundling data channel and RTP? - Tex… Christer Holmberg
- Re: [MMUSIC] Bundling data channel and RTP? - Tex… Roman Shpount
- Re: [MMUSIC] Bundling data channel and RTP? - Tex… Christer Holmberg
- Re: [MMUSIC] Bundling data channel and RTP? - Tex… Paul Kyzivat
- Re: [MMUSIC] Bundling data channel and RTP? - Tex… GUBALLA, JENS (JENS)
- Re: [MMUSIC] Bundling data channel and RTP? - Tex… Magnus Westerlund