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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> Thu, 25 April 2019 18:17 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Roman Shpount <roman@telurix.com>
CC: "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: Thu, 25 Apr 2019 18:17:41 +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,

>The timer should start when the connectivity checks start by the remote ICE agent. The timer is needed to make sure local candidate addresses continue
>to accept STUN binding requests for at least some minimal time, so technically timer should start from the time remote ICE agent was informed about
>candidate addresses and started connectivity checks. There is some signaling delay involved here, so it needs to accounted by the timer value.

An agent doesn’t know when the peer agent will start - especially not the offerer. If it sends an INVITE with its candidates, it may take a while before the INVITE even reaches the peer agent, due to network services, call forwarding etc etc etc.

Regards,

Christer



On Thu, Apr 25, 2019 at 4:27 AM Christer Holmberg <christer.holmberg@ericsson.com<mailto:christer.holmberg@ericsson.com>> wrote:
Bringing an issue that came up in GitHub (https://github.com/cdh4u/draft-ice-pac/issues/8) to the list.

The question is: when does an agent start the “PAC timer” (perhaps we should give the timer a name)?


  1.  When the connectivity checks start; OR
  2.  When the agent has performed all checks and reaches a state where it normally would declare ICE failure?

Regards,

Christer


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