[123350] in North American Network Operators' Group
Re: IP4 Space
daemon@ATHENA.MIT.EDU (Owen DeLong)
Fri Mar 5 12:54:47 2010
From: Owen DeLong <owen@delong.com>
In-Reply-To: <FA2E47FFA50291418803D2E7C1DF07F30A6A6D18@SDEXCL01.Proflowers.com>
Date: Sat, 6 Mar 2010 01:51:53 +0800
To: "Thomas Magill" <tmagill@providecommerce.com>
Cc: nanog@merit.edu
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On Mar 6, 2010, at 1:37 AM, Thomas Magill wrote:
>> That brings a question to mind. As an ISP, with IPv4, end sites that
>> are multihoming can justify a /24 from us (or another upstream) and
>> announce it through multiple providers. With IPv6, are they supposed
> to
>> get their block from ARIN directly if they are multihoming? In other
>> words, should I _never_ allow customers to announce smaller blocks of
> my
>> IPv6 ARIN block?
>=20
> According to ARIN, you must meet their IPv4 requirements for an ARIN
> block to get an IPv6 ARIN block. That leads me to believe that the =
same
> customers who need v4 space from you would also need v6 space from =
you.
>=20
Um, not exactly.
According to ARIN, _IF_ you meet their requirements for obtaining an =
IPv4
block, then, you ALSO automatically meet their requirements for =
obtaining
an IPv6 block.
There are ALSO other ways to qualify for an IPv6 block, completely =
independent
of the qualification for or possession of an IPv4 block.
As to the question about what you should or should not allow your =
customers
to announce, that is up to you.
However, there is a specific block being used to issue ARIN end-user
assignments, and, many ISPs filter that more liberally (/48) than they
filter blocks used for allocation (/32). As such, your customers who =
are
multihomed _MAY_ have a better chance of having their prefix seen if
they use an ARIN direct assignment.
However, there is at least 1 provider (hello, AS701) that blocks nearly
all prefixes longer than /32 in IPv6, so, customers that are multihomed
and announcing a more specific from your space would appear as
if they are single-homed to Verizon customers, while they would
be invisible to Verizon customers if they use ARIN space.
There may be other providers with similar filtration policies.=20
Hurricane Electric will accept routes either way. I cannot speak in
detail about the conduct of other providers, as I do not know their
policies.
Owen
