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

Eric Rescorla <ekr@rtfm.com> Wed, 04 March 2015 20:08 UTC

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From: Eric Rescorla <ekr@rtfm.com>
Date: Wed, 04 Mar 2015 12:07:22 -0800
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To: Christer Holmberg <christer.holmberg@ericsson.com>
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Subject: Re: [rtcweb] DTLS, DTLS-SRTP, and 5-tuples
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On Wed, Mar 4, 2015 at 12:04 PM, Christer Holmberg <
christer.holmberg@ericsson.com> wrote:

>  Hi,
>
> What if you jump from an UDP candidate to a TCP candidate? At the same
> time you would be jumping from DTLS to TLS (even for SRTP, where DTLS is
> only used for key management).
>

No. You do DTLS even with TCP.

-Ekr


>
> Regards,
>
> Christer
>
> Sent from my Windows Phone
>  ------------------------------
> From: Roman Shpount <roman@telurix.com>
> Sent: ‎04/‎03/‎2015 21:59
> To: Christer Holmberg <christer.holmberg@ericsson.com>
> Cc: Simon Perreault <sperreault@jive.com>; rtcweb@ietf.org
> Subject: Re: [rtcweb] DTLS, DTLS-SRTP, and 5-tuples
>
>   On Wed, Mar 4, 2015 at 2:54 PM, Christer Holmberg <
> christer.holmberg@ericsson.com> wrote:
>
>>   Didn't we last week agree that, if the underlying transport changes,
>> the DTLS connection MUST be re-established?
>>
>> Jumping from one candidate to another is a transport change, isn't it?
>>
>>
>  In cases where ICE is used jump from on candidate to another should not
> constitute a transport change. A change in ICE ufrag should constitute the
> transport change. All ICE candidates are a single virtual transport
> channel. Without this a lot of ICE setup scenarios, such as rapid
> nomination, break down. Even changes in the c= line address, m=line port
> port, or list of candidates is not a transport change if ufrag stays the
> same.
>
>  In cases where ICE is not used, changes of address in c= line or port in
> m= line are a transport change.
>  _____________
> Roman Shpount
>
>
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>
>

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