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Re: 6MAN WG Adoption call : draft-jeong-6man-rdnss-rfc6106-bis

Lorenzo Colitti <lorenzo@google.com> Wed, 12 August 2015 01:13 UTC

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From: Lorenzo Colitti <lorenzo@google.com>
Date: Wed, 12 Aug 2015 10:12:56 +0900
Message-ID: <CAKD1Yr19bas9pUpTd7wknFqjOzohHac8D22QsGyWqUgW3+E9Cg@mail.gmail.com>
Subject: Re: 6MAN WG Adoption call : draft-jeong-6man-rdnss-rfc6106-bis
To: Tore Anderson <tore@fud.no>
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Cc: 6man Chairs <6man-chairs@tools.ietf.org>, 6man WG <ipv6@ietf.org>, 神明達哉 <jinmei@wide.ad.jp>
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On Wed, Aug 12, 2015 at 2:59 AM, Tore Anderson <tore@fud.no> wrote:

> glibc does at least, but for it to work the the interface ID must be
> written to /etc/resolv.conf. That's a corner case that isn't
> necessarily immediately obvious to the developers of the piece of
> software that interprets RAs.
>
> I can't help but think that if RFC6106 had explicitly mentioned this
> corner case, bugs such as
> https://bugzilla.redhat.com/show_bug.cgi?id=720001 could have been
> prevented. So I'm with Lorenzo on this one.
>

Yp, this is non-obvious. The Android RDNSS implementation also didn't
properly support-local DNS servers and we had to fix it in M. If the RFC
had stated this these bugs might not have happened.

When we did fix it, our assumption was mostly that the router(s) in
question were announcing link-local DNS due to a bug and that even once we
fixed the OS, it wouldn't actually work. We were surprised that (on some of
the routers, at least) it did.

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