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Re: [MMUSIC] Fwd: New Version Notification for draft-reddy-mmusic-ice-happy-eyeballs-04.txt

Ari Keränen <ari.keranen@ericsson.com> Fri, 10 January 2014 16:00 UTC

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Date: Fri, 10 Jan 2014 18:00:17 +0200
From: Ari Keränen <ari.keranen@ericsson.com>
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To: "Pal Martinsen (palmarti)" <palmarti@cisco.com>
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Cc: mmusic <mmusic@ietf.org>, "Tirumaleswar Reddy (tireddy)" <tireddy@cisco.com>
Subject: Re: [MMUSIC] Fwd: New Version Notification for draft-reddy-mmusic-ice-happy-eyeballs-04.txt
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Hi,

I read the latest draft and have a few questions. In Section 3 the draft 
says:

>    ICE [RFC5245] section 4.1.2 states that the formula in section
>    4.1.2.1 SHOULD be used.  Failing to do so may lead to ICE taking
>    longer to converge as the checklist no longer will be coordinated.
>    Therefore responsiveness of ICE candidate checks are improved when
>    both sides support Happy-Eyeballs, both sides have the same number of
>    candidate pairs, and both sides use the same Happy Eyeballs promotion
>    algorithm.

Do you mean the checklist is no longer coordinated (i.e., matching on 
both sides) if all those requirements aren't fulfilled? That sounds a 
bit strange but that's the impression I got from the text.

Also, if there is no coordination/signaling between the endpoints, what 
are the odds they'd end up using the same promotion algorithm?

>    If each ICE agent uses a different algorithm to promote IPv4
>    candidates, ICE connectivity checks will be as responsive as the
>    least aggressive algorithm.

What is "least aggressive algorithm"?


Cheers,
Ari

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