----- Forwarded message from Michael Richardson <email@example.com> -----
From: Michael Richardson <firstname.lastname@example.org>
Date: Tue, 17 May 2011 13:10:40 -0400
To: Eugen Leitl <email@example.com>
Subject: Re: [vserver] assigning less than /64 to individual guests
X-Mailer: MH-E 8.1; nmh 1.1; XEmacs 21.4 (patch 22)
>>>>> "Eugen" == Eugen Leitl <firstname.lastname@example.org> writes:
Eugen> Just sent that to the vserver list, but figured this is at
Eugen> least as relevant.
Eugen> So am I in the clear to parcel out a /64 in /80s, as long as
Eugen> all the /80 are all on the same LAN or VLAN? No autoconfig
Eugen> breakage ensues? Is 48 bits really enough for anybody?
If you are saying that you will allocate /80s to each vserver, but
actually they will not be layer-2 isolated from each other, this is just
an administrative partition, then I think it's a good idea.
You can't use autoconfig for the parts that are in the /80s.
You can arrange for your /80s to never overlap the autoconfigured stuff.
OUI-64s, when generated from OUI-48s (i.e. mac addresses) always have
ff:fe as the middle 16 bits.
In addition, bit 6 in the OUI-64 (which is bit 1 in little bit-endian,
the bit after the "broadcast" bit) will be set if the OUI-64 is believed
to be globally unique. Note that if you have IPv6 Privacy Extensions
on, then autoconfig will not necessarily set bit 6.
I would have to lookup to determine in fact privacy extensions will set
the middle 16 bits in any predictable fashion.
Permitting autoconfig to work seems like a nice thing to retain.
-- ] He who is tired of Weird Al is tired of life! | firewalls [ ] Michael Richardson, Sandelman Software Works, Ottawa, ON |net architect[ ] mcr_at_sandelman.ottawa.on.ca http://www.sandelman.ottawa.on.ca/ |device driver[ Kyoto Plus: watch the video <http://www.youtube.com/watch?v=kzx1ycLXQSE> then sign the petition. -- To UNSUBSCRIBE, email to debian-ipv6-REQUEST@lists.debian.org with a subject of "unsubscribe". Trouble? Contact email@example.com Archive: http://firstname.lastname@example.org ----- End forwarded message ----- -- Eugen* Leitl leitl http://leitl.org ______________________________________________________________ ICBM: 48.07100, 11.36820 http://www.ativel.com http://postbiota.org 8B29F6BE: 099D 78BA 2FD3 B014 B08A 7779 75B0 2443 8B29 F6BEReceived on Tue May 17 19:49:53 2011