Re: Minimum IPv6 size

3 Oct 2009


      ...
Date: Sat, 03 Oct 2009 09:27:27 +0100
From: James Aldridge <jhma@mcvax.org>
--On 2 October 2009 16:43:14 -0700 Kevin Oberman <oberman@es.net> wrote:
...
Depends on the address space it is assigned from. Most specify a maximum
prefix length of 32, but the micro-allocations and the allocations for
PI dual-homing are /48.
We consider the following to be "legal":
                /* global unicast allocations */
                route-filter 2001::/16 prefix-length-range /19-/35;
                /* 6to4 prefix */
                route-filter 2002::/16 prefix-length-range /16-/16;
                /* RIPE allocations */
                route-filter 2003::/18 prefix-length-range /19-/32;
                /* APNIC allocations */
                route-filter 2400::/12 prefix-length-range /13-/32;
                /* ARIN allocations */
                route-filter 2600::/12 prefix-length-range /13-/32;
                /* ARIN allocations */
                route-filter 2610::/23 prefix-length-range /24-/32;
                /* LACNIC allocations */
                route-filter 2800::/12 prefix-length-range /13-/32;
                /* RIPE allocations */
                route-filter 2A00::/12 prefix-length-range /13-/32;
                /* AfriNIC allocations */
                route-filter 2C00::/12 prefix-length-range /13-/32;
                /* APNIC PI allocations */
                route-filter 2001:0DF0::/29 prefix-length-range /40-/48;
                /* AFRINIC PI allocations */
                route-filter 2001:43F8::/29 prefix-length-range /40-/48;
                /* ARIN PI allocations */
                route-filter 2620::/23 prefix-length-range /40-/48;
                /* ARIN Micro-allocations */
                route-filter 2001:0500::/24 prefix-length-range /44-/48;
This means accepting prefixes ARIN says we should not, but ARIN does not
set our routing policy and I will be on a panel on that issue at NANOG in
Dearborn later this month.
It might be worth relaxing filtering within 2001::/16.  The RIPE NCC 
appears to be making /48 PI assignments from within 2001:678::/29 (e.g. the 
RIPE Meeting next week will be using 2001:67c:64::/48)
Looks like we need to relax 2001:678::/29 a bit, but I am not sure that
we will open up the entire /16. I already have such for ARIN, AfriNIC,
and APNIC.

Is there some central repository for information on this? We usually
seem to find out about such changes out of the ARIN region a bit after
the fact.
-- 
R. Kevin Oberman, Network Engineer
Energy Sciences Network (ESnet)
Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab)
E-mail: oberman@es.net			Phone: +1 510 486-8634
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