[151075] in North American Network Operators' Group
Re: filtering /48 is going to be necessary
daemon@ATHENA.MIT.EDU (Owen DeLong)
Sat Mar 10 19:47:45 2012
From: Owen DeLong <owen@delong.com>
In-Reply-To: <CAAAwwbV3D1v7138RmFw6+UxXyHgLB6HBsxZ8xrmTWNLX=GfiCw@mail.gmail.com>
Date: Sat, 10 Mar 2012 16:42:37 -0800
To: Jimmy Hess <mysidia@gmail.com>
Cc: "nanog@nanog.org" <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On Mar 10, 2012, at 6:08 AM, Jimmy Hess wrote:
> On Sat, Mar 10, 2012 at 12:52 AM, George Bonser <gbonser@seven.com> =
wrote:
>>> I'm well into my second decade of having a v6 prefix in the dfz and =
am
>>> passingly familiar with powers of two...
>> Point is that expecting people globally to take a /48 from PA space =
probably isn't a realistic expectation.
>=20
> Exactly....
> What's more realistic is you have to get a single /48 of PI space for
> people to carry that globally.
>=20
I fail to understand what difference it makes to a router whether a /48 =
is from PA or PI.
> And if you have 5 discontiguous networks, what the RIRs should do is
> carve a /44 out for your
> present and future PI allocations and issue you the 8 /48s;
Well, they carve out a /44 and issue you the /44 in most cases that I am =
aware of. Is that a problem?
If so, why? Seems rather silly.
> the PI /48 routing slots
> that you have justified need for -- arranged so that they fall within
> the same /45.
RIRs don't issue routing slots. They issue addressing blocks. Usually =
(though not always) these addressing blocks are aligned with prefixes.
Sometimes those prefixes end up in one routing slot. Sometimes more. =
Occasionally, none at all.
There is no definite relationship between network blocks issued by RIRs =
and prefixes and even less so between prefixes and routing slots.
Owen
