[140540] in North American Network Operators' Group
Re: IPv6 foot-dragging
daemon@ATHENA.MIT.EDU (Iljitsch van Beijnum)
Fri May 13 03:57:03 2011
From: Iljitsch van Beijnum <iljitsch@muada.com>
In-Reply-To: <BANLkTi=xwPaCeKvUDWUpCXiJwYO=YFZiqw@mail.gmail.com>
Date: Fri, 13 May 2011 09:56:54 +0200
To: Jimmy Hess <mysidia@gmail.com>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On 13 mei 2011, at 2:39, Jimmy Hess wrote:
> if the user starts obtaining
> multiple non-aggregable /48s from different sources, or obtains an
> additional PI allocation later, but
> keeps using the original /48.
Simple: make a rule that you don't get more than one PI block, and if =
you want a bigger one you have to return the old one. Oh wait, people =
use PI because they want to avoid renumbering? It was never meant for =
that. Maybe a good incentive to ask for the right size block in the =
first place.
The current RIR practice to reserve a /44 when a /44 is given out is a =
very bad one. It assures unfilterability, because now you have random =
sizes from /44 to /48 in the parts of the address space used for PI. And =
if say, 64k /48s are given out the space actually holds 1M /48s so if =
someone wants to blow up the IPv6 internet they can just start =
announcing a million /48s and our filters are powerless.
And that all in case a /48 isn't big enough (which is ridiculously rare =
in and of itself) to save ONE entry in the global routing table. So by =
trying to conserve the table we make it impossible to protect our =
routing tables.
> It is a heck of a lot better for network stability that any
> multi-homed user get a /32 PI,
No, that's completely ridiculous. It's like saying all flights should be =
flown with 747s just in case 10 football teams show up unexpectedly. =
That is, if a 747 could carry a million people (64k more than a small =
16-seat plane).
Yes, the IPv6 address space is big but by giving people who need more =
than 65000 subnets a /32 so they can have 4000000000 subnets is =
unbelievably wasteful for no other reason than laziness.=
