Date: Thu, 24 Aug 2006 17:45:09 -0500 From: Brooks Davis <brooks@one-eyed-alien.net> To: Chuck Swiger <cswiger@mac.com> Cc: freebsd-net@freebsd.org, Fredrik Lindberg <fli+freebsd-net@shapeshifter.se> Subject: Re: Zeroconfig and Multicast DNS Message-ID: <20060824224509.GD40213@lor.one-eyed-alien.net> In-Reply-To: <B70BC65E-A460-4BC8-8363-A5835E65A276@mac.com> References: <F77EE4452C54A9609A58CD03@garrett.local> <44EE1E48.6000006@shapeshifter.se> <D2886A30-B6C5-4F53-995B-91B96CD58592@mac.com> <44EE23E7.2010800@shapeshifter.se> <B70BC65E-A460-4BC8-8363-A5835E65A276@mac.com>
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--NtwzykIc2mflq5ck Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Thu, Aug 24, 2006 at 03:21:41PM -0700, Chuck Swiger wrote: > On Aug 24, 2006, at 3:10 PM, Fredrik Lindberg wrote: > >>Queries to 254.169.in-addr.arpa MUST return NXDOMAIN (or RCODE 3, =20 > >>to choose a non-BIND specific term). > > > >We're talking about mDNS here, not DNS. I would argue that because > >mDNS is link-local it makes perfect sense to be able to resolve > >254.169.in-addr.arpa using mDNS. >=20 > True, agreed-- that's in part (b) of what I quoted. The specific =20 > part is: >=20 > "Names that are resolvable only on the local link (such as through =20 > use of > protocols such as Link Local Multicast Name Resolution [LLMNR]) MUST NOT > be used in off-link communication." >=20 > What this means is that the hostname-to-address mapping for =20 > 254.169.in-addr.arpa addresses must be unique per interface. If you =20 > have two interfaces which are connected to different LLA subnets, =20 > 169.254.1.1 might map to hostnameA on one, and that same IP might be =20 > hostnameB on the other. Hmm, that seems to argue for some further namespace mangling so forward lookups make sense. From that perspective the namespace really should be xxx.<interface>.local internally and xxx.local on the wire. Actually doing that would probably cause all sorts of problems though. :( -- Brooks --NtwzykIc2mflq5ck Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.5 (FreeBSD) iD8DBQFE7iv1XY6L6fI4GtQRAjMVAJ4+KuzBkl9Yz3cl6utDAXzcFShCUgCg4UAg a1zXs96+/xoUn7OiZhOlDbE= =b3/E -----END PGP SIGNATURE----- --NtwzykIc2mflq5ck--
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