[136446] in North American Network Operators' Group
Re: Using IPv6 with prefixes shorter than a /64 on a LAN
daemon@ATHENA.MIT.EDU (Florian Weimer)
Thu Feb 3 08:05:44 2011
To: Ray Soucy <rps@maine.edu>
From: Florian Weimer <fweimer@bfk.de>
Date: Thu, 03 Feb 2011 13:03:36 +0000
In-Reply-To: <AANLkTimcZavnJN2gqayS2-piDvOAcw_nrJAREJ0EDTjp@mail.gmail.com>
(Ray Soucy's message of "Mon\, 24 Jan 2011 15\:53\:32 -0500")
Cc: nanog@nanog.org, carlos@lacnic.net
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
* Ray Soucy:
> Every time I see this question it' usually related to a fundamental
> misunderstanding of IPv6 and the attempt to apply v4 logic to v6.
True, you have to ignore more than a decade of IPv4 protocol
development and resort to things like pre-VLSM networking.
> That said. Any size prefix will likely work and is even permitted by
> the RFC.
Could you quote chapter and verse, please? RFC 4291 section 2.5.4
says this:
All Global Unicast addresses other than those that start with binary
000 have a 64-bit interface ID field (i.e., n + m =3D 64), formatted as
described in Section 2.5.1.
--=20
Florian Weimer <fweimer@bfk.de>
BFK edv-consulting GmbH http://www.bfk.de/
Kriegsstra=DFe 100 tel: +49-721-96201-1
D-76133 Karlsruhe fax: +49-721-96201-99
