Re: [v6ops] Apple and IPv6, a few clarifications

Erik Kline <ek@google.com> Sat, 27 June 2015 09:40 UTC

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From: Erik Kline <ek@google.com>
Date: Sat, 27 Jun 2015 18:40:02 +0900
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Cc: Vividh Siddha <vividh@apple.com>, "v6ops@ietf.org" <v6ops@ietf.org>
Subject: Re: [v6ops] Apple and IPv6, a few clarifications
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> I have long thought Apple's implementation of Happy Eyeballs is awesome.
> Tweaking the algorithm's built-in fudge factor to trend more towards IPv6
> would make it more consistent with other OSs and applications (which give
> 200-300ms Happy Eyeballs head start to IPv6, which is similar to the fudge
> factor done by Apple).  Myself, I would like the fudge factor to be
> configurable via sysctl or at least viewable via netstat (or similar).  As
> it is, it is difficult to understand why a system is heavily preferring IPv4
> or IPv6, and when it will give up; disconnecting and reconnecting the
> network is a harsh troubleshooting step for other traffic.

I *think* I've been having some moderate success with "route change
-inet 0.0.0.0 -rtt 5000000", but it's very hard to be sure...maybe
I've been lucky enough to be on really good IPv6 networks.  :)