Minimum IPv6 size

Sat Oct 3 08:27:27 UTC 2009

--On 2 October 2009 16:43:14 -0700 Kevin Oberman <oberman at 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)

James