Re: [MMUSIC] Transport tags

"Charles Eckel (eckelcu)" <eckelcu@cisco.com> Fri, 13 January 2017 14:28 UTC

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From: "Charles Eckel (eckelcu)" <eckelcu@cisco.com>
To: Magnus Westerlund <magnus.westerlund@ericsson.com>
Thread-Topic: [MMUSIC] Transport tags
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Date: Fri, 13 Jan 2017 14:28:24 +0000
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Cc: Paul Kyzivat <paul.kyzivat@comcast.net>, "mmusic@ietf.org" <mmusic@ietf.org>, Christer Holmberg <christer.holmberg@ericsson.com>
Subject: Re: [MMUSIC] Transport tags
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It is possible and people already do use UDP/TLS/BFCP with ICE and without any TCP candidates. 

Cheers,
Charles

> On Jan 13, 2017, at 12:35 AM, Magnus Westerlund <magnus.westerlund@ericsson.com> wrote:
> 
> Hi,
> 
> A question, is the UDP/DTLS/BFCP only used with ICE, or are they also used without ICE support. I wonders how this relates to the discussion that the UDP/TCP destinction becomes mote when one actually are doing ICE/DTLS/BFCP, i.e. use ICE to agree on a datagram capable transport and then puts DTLS/BFCP over it, independent on what transport type the arrived candidate pairs are on.
> 
> Is there a point to the BFCP usages to actually be explicit that we one only want to use ICE negotiated DTLS secured BFCP, and thus should have a PROTO value for that, i.e. ICE/DTLS/BFCP?
> 
> Note, this is a question, not an actual proposal. Just an exploration so that you who use the protocol can consider if it makes sense.
> 
> Cheers
> 
> Magnus
> 
>> Den 2017-01-12 kl. 23:15, skrev Roman Shpount:
>> On Thu, Jan 12, 2017 at 4:45 PM, Christer Holmberg
>> <christer.holmberg@ericsson.com <mailto:christer.holmberg@ericsson.com>>
>> wrote:
>> 
>>    >I do not think TCP/DTLS/BFCP is defined anywhere, so it does not
>>    have to be backwards compatible. We are not changing the proto
>>    value, we should >define a new one and explain how it works. This
>>    leaves TCP/BFCP and TLS/BFCP as they were previously defined and
>>    simply states that these transports >cannot be used with ICE. Only
>>    UDP/DTLS/BFCP and TCP/DTLS/BFCP can be used with ICE, with ICE not
>>    supported for all the other BFCP flavors.
>> 
>>    __
>> 
>>    __ __
>> 
>>    Ok, so TCP/BFCP and TLS/BFCP will still be kept in 4583bis, and
>>    should be used when ICE is not used?____
>> 
>> 
>> 
>> TCP/BFCP, TLS/BFCP and UDP/BFCP will be kept in 4583bis and can only be
>> used when ICE is not used. UDP/DTLS/BFCP and TCP/DTLS/BFCP are two
>> transport that can be used with or without ICE.
>> 
>> Regards,
>> _____________
>> Roman Shpount
>> 
> 
> 
> -- 
> 
> Magnus Westerlund
> 
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