[147919] in North American Network Operators' Group
Re: subnet prefix length > 64 breaks IPv6?
daemon@ATHENA.MIT.EDU (Joel Maslak)
Tue Dec 27 18:39:51 2011
In-Reply-To: <CAPLq3UOF0WzrYe0ak94u=Hgd9rM-Wo=_OygMHDwroKt7Q5zGfA@mail.gmail.com>
From: Joel Maslak <jmaslak@antelope.net>
Date: Tue, 27 Dec 2011 16:38:50 -0700
To: Glen Kent <glen.kent@gmail.com>
Cc: "nanog@nanog.org" <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On Dec 27, 2011, at 4:28 PM, Glen Kent <glen.kent@gmail.com> wrote:
> I had assumed that nodes derive their link local address from the
> Route Advertisements. They derive their least significant 64 bytes
> from their MACs and the most significant 64 from the prefix announced
> in the RAs.
No, link local addresses are not derived from RAs. Even a system not connec=
ted to a router will have a link local address on each ethernet (I couldn't t=
ell you how link local works on PPP, ATM, etc, without looking it up - but i=
t doesn't require /64 networks).=
