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Re: [v6ops] Measuring the Effectiveness of Happy Eyeballs

Lorenzo Colitti <lorenzo@google.com> Wed, 10 July 2013 09:24 UTC

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From: Lorenzo Colitti <lorenzo@google.com>
Date: Wed, 10 Jul 2013 18:23:56 +0900
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To: Tony Hain <alh-ietf@tndh.net>
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Cc: "Bajpai, Vaibhav" <v.bajpai@jacobs-university.de>, "v6ops@ietf.org WG" <v6ops@ietf.org>
Subject: Re: [v6ops] Measuring the Effectiveness of Happy Eyeballs
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On Tue, Jul 9, 2013 at 4:09 AM, Tony Hain <alh-ietf@tndh.net> wrote:

> If the IPv6 path is not given an automated preference the traffic will
> never
> move. Even with emerging deployment on 'services', the cache topologies
> are not identical in every instance, and getting them there requires
> demonstrated traffic.


Actually it's worse than that. Even when topology is congruent and IPv4 and
IPv6 have exactly the same latency, a "use the first connection that
completes" implementation with no preference will use IPv4 50% of the time,
just due to statistical noise (introduced, if nothing else, by hashing
along the path).


> Apple's implementation is "not helpful". They start by refusing to allow
> modifications to the 3484 policy table to meet local policies, then follow
> that with a refusal to ack that the IPv4 cache nodes are generally closer
> to
> the request than the IPv6 ones, so traffic stays on IPv4 when it could &
> should have moved.


They also bias in favour of IPv4 because they send the A query before the
AAAA query (or at least they used to).

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