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

Roman Shpount <roman@telurix.com> Wed, 04 March 2015 19:59 UTC

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Date: Wed, 04 Mar 2015 14:59:42 -0500
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From: Roman Shpount <roman@telurix.com>
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 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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