IPv6 PI block is announced - update your filters 2620:0000::/23

Bjoern A. Zeeb bzeeb-lists at lists.zabbadoz.net
Fri Sep 15 23:39:20 CEST 2006

On Fri, 15 Sep 2006, Gert Doering wrote:


> On Thu, Sep 14, 2006 at 12:05:16AM +0200, Jeroen Massar wrote:
>> It's update your IPv6 filters time:
>> http://www.arin.net/reference/ip_blocks.html
>> 8<-----------------------------------------
>> IPv6 Assignment Blocks   CIDR Block
>> 2620:0000:/23
>> ----------------------------------------->8
>> Expect blocks in between /40 and /48 there.
> Filter recommendation document updated.

Could you also add blocks like 2800::/23 from LACNIC issued
Nov 2005 by IANA?

> Does the policy really permit /40.../47 assignments?

The only thing I found so far is [1] which really only
defines the <=48 end. It's talking about _at least_ a /44
reserved for future growth and it says "When possible, [subsequent]
assignments will be made from an adjacent address block.".

Considering what we see with v4 PI (direct assignments) today
and had seen with /8 PA and an undefined ("open") other end in
ARIN policy I wouldn't trust any >=40 rule being the maximum
for this block.

I have so far decided to use (also see [2]):

! + ARIN PI (chose whatever one you think is worse)
!ipv6 prefix-list ipv6-ebgp-strict seq 135 deny 2620::/23 le 128
ipv6 prefix-list ipv6-ebgp-strict seq 135 permit 2620::/23 ge 32 le 48

Happy weekend.


[1] http://www.arin.net/policy/nrpm.html#six582
 	6.5.8. Direct assignments from ARIN to end-user organizations Initial assignment size Subsequent assignment size

[2] http://sources.zabbadoz.net/ipv6/v6-prefix-filter-20060913-public.cfg

Bjoern A. Zeeb				bzeeb at Zabbadoz dot NeT

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