Re: [homenet] Let's make in-home ULA presence a MUST !?

Lorenzo Colitti <lorenzo@google.com> Thu, 16 October 2014 13:22 UTC

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From: Lorenzo Colitti <lorenzo@google.com>
Date: Thu, 16 Oct 2014 22:22:03 +0900
Message-ID: <CAKD1Yr2aLTjEo=7yj+=RzU8vpQTG6UjsuUJq+ONJmMTOEF43SQ@mail.gmail.com>
To: Mark Andrews <marka@isc.org>
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Cc: "homenet@ietf.org" <homenet@ietf.org>, Michael Thomas <mike@mtcc.com>, Ted Lemon <mellon@fugue.com>
Subject: Re: [homenet] Let's make in-home ULA presence a MUST !?
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On Thu, Oct 16, 2014 at 8:26 AM, Mark Andrews <marka@isc.org> wrote:

> Unless you have really old stacks your device will pick the new GUA first to
> talk to your jukebox when you are on your neighbor's network and the ULA
> to talk to it when you are on your own.
>

No, it won't. It will pick GUA->GUA both times.

Per the table in http://tools.ietf.org/html/rfc6724#section-2.1 it will
pick the GUA as a destination address, and per Rule 6, it will choose the
GUA to connect to it.

Which means that if you *want* to force it to use ULA inside the network
and GUA outside, the only scalable option is to use split-tunnel DNS. You
could change the policy table too, but most users won't, unless the
standards change, and major OSes change the policy tables.