[85470] in North American Network Operators' Group
Re: Requesting P.I. Space from ARIN - latest issues?
daemon@ATHENA.MIT.EDU (Joe Abley)
Tue Oct 11 12:01:24 2005
In-Reply-To: <Pine.LNX.4.63.0510111126040.31266@whammy.cluebyfour.org>
Cc: nanog@merit.edu
From: Joe Abley <jabley@isc.org>
Date: Tue, 11 Oct 2005 11:59:58 -0400
To: Justin M.Streiner <streiner@cluebyfour.org>
Errors-To: owner-nanog@merit.edu
On 11-Oct-2005, at 11:33, Justin M. Streiner wrote:
> On Tue, 11 Oct 2005, up@3.am wrote:
>
>> 1) I meet the Multihoming requirement, which means I can get a
>> block as
>> small as a /22, which is about right for my needs. Are there
>> still any
>> concerns about networks (as Verio and Sprint have done in the past)
>> filtering out longer prefixes, and if so, does it depend on
>> whether it;s
>> former class A, B, C or swamp space? I know when I got my current
>> block
>> from my upstream, I had to make sure I got swamp space, because
>> the former
>> class B block they initially allocated to me wouldn't have made it
>> past
>> Verio's filters at that time.
>
> Most if not all of the /8s that get assigned to ARIN have a
> prescribed minimum allocation size. How rigorously that is
> followed is another story :-)
I believe it is followed rigourously for new assignments, and that /
22 assignments are made from a range of addresses whose minimum
allocation size is /22 (or longer).
ISPs who filter based on prefix length according to RIR minimum
allocation sizes should not block a route based on such an
assignment, assuming their filters are up-to-date.
Whether or not any particular prefix is blocked is best determined
experimentally (e.g. feed a box with two interface addresses from
different ranges a list of hosts to ping at a polite, low frequency,
and compare the results sourced from each address).
I have had dealings with many ISPs who have announced blocks based on
fairly long-prefix assignments from RIRs, following policies such as
ARIN's multi-homing assignment policy, and I haven't heard of any
substantial problems due to the prefix length. James' MMV, of course.
> I don't think you can specifically request that ARIN assign you
> space out of the swamp these days.
You can request anything you like. Whether it makes a difference is
another thing entirely :-)
Joe
