Re: [rtcweb] CNAMEs and multiple peer connections
Magnus Westerlund <magnus.westerlund@ericsson.com> Wed, 12 March 2014 08:29 UTC
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Date: Wed, 12 Mar 2014 09:29:35 +0100
From: Magnus Westerlund <magnus.westerlund@ericsson.com>
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To: Martin Thomson <martin.thomson@gmail.com>
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Subject: Re: [rtcweb] CNAMEs and multiple peer connections
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On 2014-03-10 16:49, Martin Thomson wrote: > On 10 March 2014 16:19, Magnus Westerlund > <magnus.westerlund@ericsson.com> wrote: >> Can you please think through the linkage issue a bit first before >> changing this property. > > We already came to the conclusion that if media was being forwarded by > a peer, then that is new media originated by that peer, not the same > media. Thus, if looping occurs, it is at the application layer. We > definitely already agreed that RTP forwarding is not a function that a > browser will support. I like to point out that the agreement and what is documented in rtp-usage is that WebRTC endpoint will have to make forwarded streams appear as locally originated. However, this as currently written does not apply to RTP middleboxes that interconnects multiple PeerConnections to form a multi-party session. This is deliberate to ensure that RTP topologies like RTP mixer and SFM do work on the RTP/RTCP level. > > Obviously, if we add that feature, CNAMEs will be just one of the > manifold issues that will arise and we will have to reconsider. > Compromising the privacy of users doesn't seem like a good trade-off > against some minor advantages in terms of loop detection (unlikely) > and synchronization (easy to apply manually). I am especially interested to know how you will "easy to apply manually" the synchronization. Can you please describe that. Because, that either requires an API call to tell the media framework, please consider the following CNAMES as equivalent, or some other method of telling the media framework that these different MST are actually originating from a common clock base. I protested about this, not to lower the users privacy, but over the concern that this was raised without providing a case where it was obvious that the user's privacy was impacted. Martin, you said that you would think about it, and the next statement was lets change it, without providing any motivation why the concern was significant. >From my perspective, if you can provide a good explanation how to actually accomplish the synchronization, I think a change of scoping the CNAME to a PeerConnection is okay. But, I would like to understand how you believe it is accomplished. Magnus Westerlund (As RTP-usage author) ---------------------------------------------------------------------- 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 ----------------------------------------------------------------------
- [rtcweb] CNAMEs and multiple peer connections Martin Thomson
- Re: [rtcweb] CNAMEs and multiple peer connections Magnus Westerlund
- Re: [rtcweb] CNAMEs and multiple peer connections Martin Thomson
- Re: [rtcweb] CNAMEs and multiple peer connections Justin Uberti
- Re: [rtcweb] CNAMEs and multiple peer connections Martin Thomson
- Re: [rtcweb] CNAMEs and multiple peer connections Martin Thomson
- Re: [rtcweb] CNAMEs and multiple peer connections Harald Alvestrand
- Re: [rtcweb] CNAMEs and multiple peer connections Dan Wing
- Re: [rtcweb] CNAMEs and multiple peer connections Martin Thomson
- Re: [rtcweb] CNAMEs and multiple peer connections Magnus Westerlund
- Re: [rtcweb] CNAMEs and multiple peer connections Martin Thomson
- Re: [rtcweb] CNAMEs and multiple peer connections Magnus Westerlund
- Re: [rtcweb] CNAMEs and multiple peer connections Magnus Westerlund
- Re: [rtcweb] CNAMEs and multiple peer connections Martin Thomson
- Re: [rtcweb] CNAMEs and multiple peer connections Justin Uberti
- Re: [rtcweb] CNAMEs and multiple peer connections Magnus Westerlund
- Re: [rtcweb] CNAMEs and multiple peer connections Dan Wing
- Re: [rtcweb] CNAMEs and multiple peer connections Magnus Westerlund
- Re: [rtcweb] CNAMEs and multiple peer connections Martin Thomson
- Re: [rtcweb] CNAMEs and multiple peer connections Magnus Westerlund
- Re: [rtcweb] CNAMEs and multiple peer connections Justin Uberti
- Re: [rtcweb] CNAMEs and multiple peer connections Watson Ladd
- Re: [rtcweb] CNAMEs and multiple peer connections Martin Thomson
- Re: [rtcweb] CNAMEs and multiple peer connections Justin Uberti
- Re: [rtcweb] CNAMEs and multiple peer connections Justin Uberti
- Re: [rtcweb] CNAMEs and multiple peer connections Watson Ladd
- Re: [rtcweb] CNAMEs and multiple peer connections Magnus Westerlund
- Re: [rtcweb] CNAMEs and multiple peer connections Justin Uberti