[sig-ipv6] BOUNCE sig-ipv6@lists.apnic.net: Non-member submission from [Robert Elz <kre@munnari.OZ.AU>]

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>From owner-sig-ipv6  Sat Jul  8 02:48:42 2000
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From: Robert Elz <kre@munnari.OZ.AU>
To: Tim Chown <tjc@ecs.soton.ac.uk>
Cc: ipng@sunroof.eng.sun.com, ngtrans@sunroof.eng.sun.com, arano@byd.ocn.ad.jp,
        sig-ipv6@apnic.net, mir@ripe.net, joao@ripe.net
Subject: Re: (ngtrans) Fw: [apnic-announce] IPv6 Policy Document Revision 
In-Reply-To: Your message of "Fri, 07 Jul 2000 17:25:08 +0100."
             <Pine.SOL.4.20.0007071703400.16436-100000@penelope.ecs.soton.ac.uk> 
Date: Sat, 08 Jul 2000 02:48:10 +1000
Message-Id: <17347.962988490@mundamutti.cs.mu.OZ.AU>

    Date:        Fri, 7 Jul 2000 17:25:08 +0100 (BST)
    From:        Tim Chown <tjc@ecs.soton.ac.uk>
    Message-ID:  <Pine.SOL.4.20.0007071703400.16436-100000@penelope.ecs.soton.ac.uk>

  | But that's where the /35 "pressure" applies because if (say) UKERNA wanted 
  | to offer a /40 to each University

Why would i want to do that?   /48 to everyone is what should be offered.
If a site is truly *huge* (that is, is so big an IPv4 class A net isn't
enough for it) then perhaps it gets a /47 - or even a /46.   Why would
anyone routinely be allocating /40?

  | Of course they're not all big, varying from maybe 4,000 to 40,000 people,
  | so most could live under a /48.

All of those could live in a /48.

  | I would be interested to know what the addressing requirements of a mobile 
  | provider would be, in terms of scale and subnetting.

If one assumes (which would probably be wrong) that all the mobile
nodes are sharing some kind of switched link level, then one /64
would be enough for all of that ... Of course, that would make for
pretty huge tables, so some degree of subnetting might be appropriate.
But a /48 is probably going to be enough, even for that size site.
And of course, some of the mobiles might be gateways to other local
nets in which case those nets would be getting their own /48 (or
if they really don't need it, perhaps just /64).

kre

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