[147882] in North American Network Operators' Group
Re: subnet prefix length > 64 breaks IPv6?
daemon@ATHENA.MIT.EDU (Alexandru Petrescu)
Sat Dec 24 06:17:11 2011
Date: Sat, 24 Dec 2011 12:16:07 +0100
From: Alexandru Petrescu <alexandru.petrescu@gmail.com>
To: nanog@nanog.org
In-Reply-To: <1324724331.2763.20.camel@karl>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
Le 24/12/2011 11:58, Karl Auer a écrit :
> On Sat, 2011-12-24 at 15:37 +0530, Glen Kent wrote:
>> Ok. So does SLAAC break with masks> 64?
>
> "Break" is not the right word. SLAAC only works with /64, But that is
> by design.
SLAAC only works with /64 - yes - but only if it runs on Ethernet-like
Interface ID's of 64bit length (RFC2464).
SLAAC could work ok with /65 on non-Ethernet media, like a
point-to-point link whose Interface ID's length be negotiated during the
setup phase.
Other non-64 Interface IDs could be constructed for 802.15.4 links, for
example a 16bit MAC address could be converted into a 32bit Interface
ID. SLAAC would thus use a /96 prefix in the RA and a 32bit IID.
IP-over-USB misses an Interface ID altogether, so one is free to define
its length.
Alex
>
> Regards, K.
>
