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

Lorenzo Colitti <lorenzo@google.com> Thu, 16 October 2014 13:37 UTC

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From: Lorenzo Colitti <lorenzo@google.com>
Date: Thu, 16 Oct 2014 22:37:13 +0900
Message-ID: <CAKD1Yr3WppcpKWjzJOUNu4VS_2C5U5aeUGG2+k4u8goG3fZ1Dw@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 10:33 PM, 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.
>
> Actually it depends on which address has the longest match.  With
> old stacks they are both treats as GUA.  ULA has at least 8 bits
> in common but may have up to 47 bits in common.  The GUA is likely
> to have 16+ bits in common.  There is no guarentee that the old
> pair of addresses have been flushed to only leave the GUA.
>

No, it doesn't. Please read RFC 6724 again, or at least read the links I
provided.