[106998] in North American Network Operators' Group
Re: It's Ars Tech's turn to bang the IPv4 exhaustion drum
daemon@ATHENA.MIT.EDU (Seth Mattinen)
Tue Aug 19 13:38:52 2008
Date: Tue, 19 Aug 2008 10:37:42 -0700
From: Seth Mattinen <sethm@rollernet.us>
To: nanog@nanog.org
In-Reply-To: <48AB021D.40508@mtcc.com>
Errors-To: nanog-bounces@nanog.org
Michael Thomas wrote:
> Justin M. Streiner wrote:
>> On Tue, 19 Aug 2008, michael.dillon@bt.com wrote:
>>
>>>> I don't have a problem with assigning customers a /64 of v6
>>>> space.
>>>
>>> Why so little? Normally customers get a /48 except for residential
>>> customers who can be given a /56 if you want to keep track of
>>> different block sizes. If ARIN will give you a /48 for every
>>> customer, then why be miserly with addresses?
>>
>> I don't operate an ISP network (not anymore, anyway...). My customers
>> are departments within my organization, so a /64 per department/VLAN
>> is more sane/reasonable for my environment.
>
> Uh, the lower 64 bits of an IP6 address aren't used for routing you
> know? They're essentially the mac address, or some other sort of
> autoconf'd host identifier. Last I heard, the smallest allocation is
> supposed to be a /48 -- I hadn't heard of the /56 thing that Michael
> was speaking of, though I'm not surprised. There's 64 bits for
> routing... no need to be so stingy :)
>
Last time I asked about this on the ipv6 list I got smacked for thinking
about using anything other than a /64 for subnets, even on point to
point links.
~Seth
