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

Christer Holmberg <christer.holmberg@ericsson.com> Mon, 15 June 2015 18:21 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] Draft new version: BUNDLE-21
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Date: Mon, 15 Jun 2015 18:21:48 +0000
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Subject: Re: [MMUSIC] Draft new version: BUNDLE-21
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Hi Paul,

The "received packets" text was not added in this version.

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

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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