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Re: [rtcweb] DTLS, DTLS-SRTP, and 5-tuples

Christer Holmberg <christer.holmberg@ericsson.com> Fri, 13 March 2015 11:10 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Iñaki Baz Castillo <ibc@aliax.net>
Thread-Topic: [rtcweb] DTLS, DTLS-SRTP, and 5-tuples
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Date: Fri, 13 Mar 2015 11:09:57 +0000
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Cc: Cullen Jennings <fluffy@cisco.com>, Jonathan Lennox <jonathan@vidyo.com>, "rtcweb@ietf.org" <rtcweb@ietf.org>
Subject: Re: [rtcweb] DTLS, DTLS-SRTP, and 5-tuples
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BTW, is this going to be discussed in Dallas?

Regards,

Christer

From: Iñaki Baz Castillo [mailto:ibc@aliax.net]
Sent: 13. maaliskuuta 2015 13:07
To: Christer Holmberg
Cc: Jonathan Lennox; Cullen Jennings; rtcweb@ietf.org; Justin Uberti
Subject: Re: [rtcweb] DTLS, DTLS-SRTP, and 5-tuples


Guys, this thread is getting surreal :)
On 13 Mar 2015 12:02, "Christer Holmberg" <christer.holmberg@ericsson.com<mailto:christer.holmberg@ericsson.com>> wrote:
Hi Justin,

>>>>>> New things can be defined in the future. When they do, they should treat ICE a virtual communication channel that
>>>>>> provides unreliable packet transport with no order guarantees which can span multiple 5-tuples.
>>>>>
>>>>> Then the scope of what we discuss now should not be "whatever protocol" - it should be the specific protocols we are discussing.
>>>>
>>>> I think ICE-bis should define protocol requirements for the protocols that can run on top of ICE, which includes:
>>>> 1. Ability to run over unreliable packet based transport with no order guarantees
>>>> 2. Ability to demux with STUN packets
>>>> 3. Not make any assumption about IP addresses, ports, or other transport level protocols attributes such as TOS.
>>>
>>> I think these are good criteria. Note that TCP would meet these criteria, and I see no problem running TCP atop ICE (we used to do this in an old version of our data channel code).
>>
>> I don't think a TCP connection can span over multiple 5-tuples - each TCP connection will be bound to one 5-tuple.
>
> I don't agree. SCTP can be tunneled over UDP, as we know, so why not TCP? The ports in such a tunnel scenario are just as unnecessary as in SCTP over UDP.

We need to be clear about what we mean.

When I say "TCP", I mean plain TCP :)

If we talk about TCP-over-UDP, we should say "TCP-over-UDP" :)

Regards,

Christer
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