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Re: IPv6 prefixes longer then /64: are they possible in DOCSIS

daemon@ATHENA.MIT.EDU (Leo Bicknell)
Tue Nov 29 11:47:48 2011

Date: Tue, 29 Nov 2011 08:46:49 -0800
From: Leo Bicknell <bicknell@ufp.org>
To: nanog@nanog.org
Mail-Followup-To: nanog@nanog.org
In-Reply-To: <CALFTrnNa2Vp7e6SubguWCinURBwngi5CzcoFY5+1LC9D8m-gYw@mail.gmail.com>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org


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In a message written on Tue, Nov 29, 2011 at 11:39:06AM -0500, Ray Soucy wr=
ote:
> We run both systems, in production, using DHCPv6 on prefixes much
> smaller than 64-bit (typically 120 or 119; we mirror whatever the IPv4
> prefix length is).

Can you explain a bit more about how this works?  My understanding
of the current DHCPv6 implementations is that they had a hard
assumption of a /64 prefix and the ability to do SLAAC and hear a
valid RA in order to do DHCPv6.  Are you doing anything special to
make this happen with smaller subnets?

--=20
       Leo Bicknell - bicknell@ufp.org - CCIE 3440
        PGP keys at http://www.ufp.org/~bicknell/

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