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Re: [Ice] ICE PAC: When to start the timer waiting for possible peer reflexive candidates?

Roman Shpount <roman@telurix.com> Fri, 26 April 2019 15:08 UTC

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References: <3A66B735-03C9-41FF-95AD-500B0D469C80@ericsson.com> <CAD5OKxsMgNTQPNP4Ni72H+yD4iUeyNK+x6CSvdBApGnPTpr_vg@mail.gmail.com> <A4EC3C01-4D7D-45DF-876D-E58706F74866@ericsson.com> <CAD5OKxt8tDemkK=v4X1gjwJGLYrxcd95S7uV53_fsga6grZ_rA@mail.gmail.com> <30518269-CA9D-4F50-8CE3-062A01DBCD7F@mozilla.com> <CAD5OKxvmRK8Xzu4FSRv3Lgdg-VrrufzGhjAdSmfcLLkrm-jtjw@mail.gmail.com> <0AD3077C-74FA-4585-942A-375B83B3A7A0@ericsson.com>
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From: Roman Shpount <roman@telurix.com>
Date: Fri, 26 Apr 2019 11:07:50 -0400
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To: Christer Holmberg <christer.holmberg@ericsson.com>
Cc: Nils Ohlmeier <nohlmeier@mozilla.com>, "ice@ietf.org" <ice@ietf.org>
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Subject: Re: [Ice] ICE PAC: When to start the timer waiting for possible peer reflexive candidates?
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Hi Christer,

On Fri, Apr 26, 2019 at 3:06 AM Christer Holmberg <
christer.holmberg@ericsson.com> wrote:

> There is one more option (which has been my assumption):
>
>
>
> 4) Start the timer when the agent would otherwise declare ICE failure,
> i.e., when it has tested all available candidate pairs.
>
>
>
I think this option does not work quite well. With option 4, when ICE agent
has a list of valid remote candidates and all these candidates do not fail
immediately with ICMP error, ICE agent will spend enough time trying those
candidates before failing for any remote binding attempts to arrive. So,
option 4 ends up adding extra time when it is not needed.  On the other
hand, when ICE agent does not get any remote candidates, it can go into a
failed state and start timeout before local candidates collected by this
agent were delivered to remote over signaling causing a premature failure.

Regards,
_____________
Roman Shpount

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