[111479] in North American Network Operators' Group
Re: v6 & DSL / Cable modems
daemon@ATHENA.MIT.EDU (Iljitsch van Beijnum)
Fri Feb 6 10:14:47 2009
From: Iljitsch van Beijnum <iljitsch@muada.com>
To: Joe Loiacono <jloiacon@csc.com>
In-Reply-To: <OF16505956.D298E629-ON85257555.00516000-85257555.0052A478@csc.com>
Date: Fri, 6 Feb 2009 16:14:33 +0100
Cc: nanog@merit.edu
Errors-To: nanog-bounces@nanog.org
On 6 feb 2009, at 16:02, Joe Loiacono wrote:
>> Given that ARIN at least is assigning end-user /48s out of 2620::/23
>> it would be useful to accept these announcements. If not end-user PI
>> is dead in the water. Some providers might like that. End-users
>> probably won't.
> That range alone is 25 bits of routing, equivalent to routing all
> the way
> down to /25s in the IPv4 world. But I don't see how you could route
> some
> /48s without having software to route all /48s and that is
> hugemongous.
> And then times 4 for 128 bits. But, I'm not a routing engine guy, so
> I'm
> probably missing something ...
The problem is that ARIN reserves a /44 for every /48 they give out.
So that means the most you'll see out of that /23 is 2M prefixes (I
don't think there are many routers out there that can handle a v6
table this large) but since you need to accept /48s, this could be
deaggregated into 32M prefixes.
The RIRs need to stop this reservation stuff, it makes prefix length
filtering impossible.
