[130943] in North American Network Operators' Group
Re: Definitive Guide to IPv6 adoption
daemon@ATHENA.MIT.EDU (Owen DeLong)
Mon Oct 18 14:09:20 2010
From: Owen DeLong <owen@delong.com>
In-Reply-To: <4CBC7CD9.8050506@brightok.net>
Date: Mon, 18 Oct 2010 11:07:43 -0700
To: Jack Bates <jbates@brightok.net>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On Oct 18, 2010, at 9:59 AM, Jack Bates wrote:
>=20
>=20
> On 10/18/2010 11:47 AM, Randy Carpenter wrote:
>>=20
>> Unfortunately, it is not as easy as that in practice.
>>=20
>> I recently worked with a customer that has ~60,000 customers
>> currently. We tried to get a larger block, but were denied. ARIN said
>> they would only issue a /32, unless immediate usage could be shown
>> that required more than that. Their guidelines also state /56 for
>> end-users. I am a big proponent of nibble boundaries, too. I think if
>> you are too big to use only a /32, you should get a /28, /24, and so
>> forth. It would make routing so much nicer to deal with. /31 and
>> such is just nasty.
>>=20
>>=20
>=20
> ARIN does reservations (unsure at what length, but at least down to =
/31). If you were to fill the /32 quickly, you could easily request the =
next block. To my knowledge, they've only handed out 1 or 2 networks =
shorter than /32.
>=20
Not any more...
ARIN now uses allocation by bisection.
> Correct me if I'm wrong, but isn't 60,000 customers at /56 2^24 =
assignments from a /32? Seems plenty. Even at /48 assignments, you'd get =
65,536 assignments. So how can you justify more than a /32?
>=20
The customers should get /48s. The /56 guideline is merely that and only =
for the smallest of sites. It's also subsequently turned out to be bad =
advice.
60,000 customers may well be more than 65,536 end sites. Also, you need =
to leave room for numbering infrastructure, sizing POPs to prefixes, =
etc.
It's much more complex than just number of customers =3D number of /48s.
Unfortunately, current policy doesn't recognize that other than HD =
ratio. However, 60,000 customers each with a /48 would far exceed the =
.94
HD ratio requirement for larger than a /32. IIRC, under current policy =
it would justify a /30 or possibly a /29.
Owen
