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

Christer Holmberg <christer.holmberg@ericsson.com> Fri, 26 April 2019 20:28 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Roman Shpount <roman@telurix.com>
CC: Nils Ohlmeier <nohlmeier@mozilla.com>, "ice@ietf.org" <ice@ietf.org>
Thread-Topic: [Ice] ICE PAC: When to start the timer waiting for possible peer reflexive candidates?
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Date: Fri, 26 Apr 2019 20:28:16 +0000
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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,

In a non-trickle case, I think it would be very strange if the agent didn’t get any candidates front the peer agent.

Regards,

Christer
________________________________
From: Roman Shpount <roman@telurix.com>
Sent: Friday, April 26, 2019 6:07:50 PM
To: Christer Holmberg
Cc: Nils Ohlmeier; ice@ietf.org
Subject: Re: [Ice] ICE PAC: When to start the timer waiting for possible peer reflexive candidates?


Hi Christer,

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