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Re: [MMUSIC] Draft new version: BUNDLE-21

Paul Kyzivat <pkyzivat@alum.mit.edu> Mon, 15 June 2015 18:42 UTC

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Date: Mon, 15 Jun 2015 14:42:09 -0400
From: Paul Kyzivat <pkyzivat@alum.mit.edu>
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To: Christer Holmberg <christer.holmberg@ericsson.com>, "mmusic@ietf.org" <mmusic@ietf.org>
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Subject: Re: [MMUSIC] Draft new version: BUNDLE-21
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On 6/15/15 2:21 PM, Christer Holmberg wrote:
> Hi Paul,
>
> The "received packets" text was not added in this version.

Fair enough. But the point remains.

> But, I hear what you are saying, so perhaps we instead should say "received data"?

That would fix it here. But the usage is elsewhere, with the same concern.

	Thanks,
	Paul

> Regards,
>
> Christer
>
> -----Original Message-----
> From: mmusic [mailto:mmusic-bounces@ietf.org] On Behalf Of Paul Kyzivat
> Sent: 15 June 2015 20:14
> To: mmusic@ietf.org
> Subject: Re: [MMUSIC] Draft new version: BUNDLE-21
>
> One comment, on section 9.1:
>
>      This document describes a mechanism to identify the protocol of a
>      received packet among the STUN, DTLS and SRTP protocols (in any
>      combination), when UDP is used as transport-layer protocol, but does
>      not describe how to identify different protocols transported on DTLS.
>      While the mechanism is generally applicable to other protocols and
>      transport-layers protocols, any such use requires further
>      specification around how to multiplex multiple protocols on a given
>      transport-layer protocols, and how to associate received packets with
>      the correct protocols.
>
> ISTM that something is still missing from this section. It *assumes* that the transport protocol packages things into packets, and that each such packet can be associated with one of the application protocols sharing it.
>
> Consider TCP: while it uses packets on the network, it is a stream oriented transport. Upper layers built for TCP may not have any notion of packets. It is probably infeasible to multiplex m-lines for such protocols using BUNDLE.
>
> The protocols we have been thinking of either don't work over stream oriented protocols, or else define a way to packetize.
>
> This could get complex. The simple thing to do is to specify that stream-oriented transports are out of scope for this document.
>
> 	Thanks,
> 	Paul
>
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