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Re: [Ice] ICE Generation clarification questions

Taylor Brandstetter <deadbeef@google.com> Mon, 27 February 2017 21:55 UTC

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From: Taylor Brandstetter <deadbeef@google.com>
Date: Mon, 27 Feb 2017 13:55:52 -0800
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To: Peter Saint-Andre <stpeter@stpeter.im>
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Cc: Thomas Stach <thomass.stach@gmail.com>, ice@ietf.org
Subject: Re: [Ice] ICE Generation clarification questions
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Another way of looking at it is that a given generation is identified by a
local/remote ufrag pair, which will change on ICE restart.

On Mon, Feb 27, 2017 at 1:53 PM, Peter Saint-Andre <stpeter@stpeter.im>
wrote:

> On 2/27/17 2:13 AM, Thomas Stach wrote:
> > Hi,
> >
> > I'm a bit confused about the definition of an ICE Generation and how it
> > is used in Section 14
>
> To be clear for folks on the list, this is in reference to the trickle
> draft.
>
> >    Generation:  The complete set of candidates sent within an ICE
> >       negotiation session.
> >
> >
> >
> > Section 14 and the definition of Half/Full Trickle then uses terms like
> > "first generation"
> > "complete generation",
>
> For half trickle purposes, I think it would be best to use the phrase
> "full generation" or even "complete set of candidates". That is: under
> half trickle, in the initial ICE description the initiator sends all the
> candidates it might possibly send.
>
> > "the responder can respond with an incomplete generation of candidates",
> >
> > "full generation"
> >
> > This seems to imply that the generation is not necessarily the complete
> > set of candidates,
>
> The generation is as defined above: the complete set of candidates sent
> within an ICE negotiation session. It would be better here to use the
> phrase "incomplete set of candidates".
>
> > but could grow during aICE Negotiation Session until end-of-candidates
> > is signalled.
> > So the generation rather seems to be the extensible set of currently
> > known/exchanged candidates.
>
> No, the generation is everything sent before an ICE restart (if any). In
> trickle the set can grow over time, whereas in regular ICE it can't.
>
> > It is also not clear to me if the candidates sent by the ICE initiator
> > and the ICE responder
> > belong to  different generations or if the generation is the union of
> > both candidate sets.
>
> It is the union.
>
> Peter
>
>
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