Re: [MMUSIC] DTLS-over-SCTP, anyone?
Christer Holmberg <christer.holmberg@ericsson.com> Thu, 11 February 2016 19:47 UTC
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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Roman Shpount <roman@telurix.com>
Thread-Topic: [MMUSIC] DTLS-over-SCTP, anyone?
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Date: Thu, 11 Feb 2016 19:46:00 +0000
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Subject: Re: [MMUSIC] DTLS-over-SCTP, anyone?
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>I am fine with this language except it should be "address and/or port" not "IP address and/or >port". Correct. I thought I had fixed all that, but it seems like I forgot one instance :) Regards, Christer On Thu, Feb 11, 2016 at 8:06 AM, Christer Holmberg <christer.holmberg@ericsson.com<mailto:christer.holmberg@ericsson.com>> wrote: Hi Roman, What about the following new section 3.2: “3.2. Change of Local Transport Parameters If an endpoint modifies its local transport parameters (IP address and/or port), and if the modification requires a new DTLS association, the endpoint MUST either change its DTLS role, its fingerprint value and/or use the SDP 'dtls-connection' attribute with a 'new' value Section 4. If the underlying transport explicitly prohibits a DTLS association to span multiple transports, the SDP 'dtls-connection' attribute MUST be set to 'new' if the transport is changed. An example of such case is when DTLS is carried over SCTP, as described in [RFC6083].” Regards, Christer From: mmusic [mailto:mmusic-bounces@ietf.org<mailto:mmusic-bounces@ietf.org>] On Behalf Of Christer Holmberg Sent: 11. helmikuuta 2016 9:09 To: Roman Shpount Cc: mmusic@ietf.org<mailto:mmusic@ietf.org> Subject: Re: [MMUSIC] DTLS-over-SCTP, anyone? Hi Roman, Your suggestion looks good. I’ll take it as a WGLC comment, and add it in the post-WGLC version of the draft :) Regards, Christer From: Roman Shpount [mailto:roman@telurix.com] Sent: 10. helmikuuta 2016 22:42 To: Christer Holmberg Cc: mmusic@ietf.org<mailto:mmusic@ietf.org> Subject: Re: [MMUSIC] DTLS-over-SCTP, anyone? On Wed, Feb 10, 2016 at 2:58 PM, Christer Holmberg <christer.holmberg@ericsson.com<mailto:christer.holmberg@ericsson.com>> wrote: >>> I think we can add the following to section 7.1 of dtls-sdp: >>> >>> If DTLS is transmitted over a reliable transport and if DTLS procedures for retransmissions are not used, for instance as described in >>> RFC 6083 for DTLS over SCTP, then DTLS association MUST NOT span across multiple transports. Using 'dtls-connection' attribute with >>> an 'existing' value in combination with change of such a reliable transport should be treated as an error and DTLS association MUST be >>> terminated. >> >> Your text as such looks ok. But, do we really want to add it as a generic restriction in draft-dtls-sdp? Shouldn't it be >> specific for DTLS-over-SCTP instead? What if someone defines DTLS-over-<new-fancy-reliable-transport> and they DO allow span? > > The reason multiple DTLS associations cannot span across several SCTP association is due to SCTP association handling DTLS packet > retransmission and DTLS procedures for retransmissions not being used. We can make a generic statement or limit this to RFC 6083 > only, but I think, stating the reason why DTLS association cannot span multiple transports is important. I agree. But, again DTLS-over-SCTP is described in draft-sctp-sdp, so I think such text belongs there. How about saying the following in draft-dtls-sdp: If DTLS is transmitted over a transport that prohibits spanning of DTLS association across multiple transports, such as DTLS over SCTP as described in RFC 6083, then 'dtls-connection' attribute MUST be set to 'new' every time transport is changed. And you can put the previous language in draft-sctp-sdp This way each draft only specified things relevant to itself. Regards, _____________ Roman Shpount
- Re: [MMUSIC] DTLS-over-SCTP, anyone? Schwarz, Albrecht (Nokia - DE)
- [MMUSIC] DTLS-over-SCTP, anyone? Christer Holmberg
- Re: [MMUSIC] DTLS-over-SCTP, anyone? Roman Shpount
- Re: [MMUSIC] DTLS-over-SCTP, anyone? Roman Shpount
- Re: [MMUSIC] DTLS-over-SCTP, anyone? Christer Holmberg
- Re: [MMUSIC] DTLS-over-SCTP, anyone? Christer Holmberg
- Re: [MMUSIC] DTLS-over-SCTP, anyone? Christian Groves
- Re: [MMUSIC] DTLS-over-SCTP, anyone? Roman Shpount
- Re: [MMUSIC] DTLS-over-SCTP, anyone? Christer Holmberg
- Re: [MMUSIC] DTLS-over-SCTP, anyone? Roman Shpount
- Re: [MMUSIC] DTLS-over-SCTP, anyone? Christer Holmberg
- Re: [MMUSIC] DTLS-over-SCTP, anyone? Roman Shpount
- Re: [MMUSIC] DTLS-over-SCTP, anyone? Christer Holmberg
- Re: [MMUSIC] DTLS-over-SCTP, anyone? Christer Holmberg
- Re: [MMUSIC] DTLS-over-SCTP, anyone? Christer Holmberg