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Re: [v6ops] An Update to Happy Eyeballs

Lorenzo Colitti <lorenzo@google.com> Wed, 22 March 2017 14:56 UTC

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From: Lorenzo Colitti <lorenzo@google.com>
Date: Wed, 22 Mar 2017 23:56:21 +0900
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To: Mark Andrews <marka@isc.org>
Cc: David Schinazi <dschinazi@apple.com>, IPv6 Operations <v6ops@ietf.org>
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Subject: Re: [v6ops] An Update to Happy Eyeballs
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On Wed, Mar 15, 2017 at 12:46 PM, Mark Andrews <marka@isc.org> wrote:

> Happy Eyeballs was never about having the absolute fastest time to
> connect.  It was about establishing a connection in a reasonable
> amount of time in presence of network / server failures without
> having ridiciously long failover delays.
>

I think this is just a naming issue. Happy Eyeballs was about avoiding
broken IPv6 connections. Period. In fact, the very first words in RFC 6555
are "When a server's IPv4 path and protocol are working, but the server's
IPv6 path and protocol are not working...".

What is written in this draft does much more than that, and calling it
"happy eyeballs" is sort of insultingly simplistic. Perhaps just drop the
words "happy eyeballs" and reposition the draft as a best current practice
to provide a good user experience in a dual-stack Internet?

I think it's extremely hard to argue that waiting for an A query when you
have an AAAA in cache (or vice versa) is going to reduce latency or improve
user experience. You can use getaddrinfo if you want, but you're going to
pay the price in terms of latency. I wouldn't call that a best practice.

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