Current Consensus on IPv6 Customer Allocation Size

Mark Blackman mark at
Wed Aug 1 23:35:45 CEST 2012

On 1 Aug 2012, at 22:25, Eugen Leitl <eugen at> wrote:

> On Wed, Aug 01, 2012 at 03:20:58PM -0600, Tim Densmore wrote:
>> On 8/1/2012 3:12 PM, Mark Blackman wrote:
>>> More than 256 subnets in the home? Who would want to manage all of that?
>> Hi Mark,
>> Thanks for the input!  It's not an argument I'm making, but one I have  
>> seen made.  Something along the lines of "in the future your fridge and  
>> TV will each need their own own subnet" - that kind of thought.  
>> Obviously that'd be a ways down the road.
> In IPv6 land, your /64 is your /32 in IPv4. Given that some of
> us run out of IPv4 /24 at home (nevermind the virtual hosts,
> kilonode and meganode hardware is coming) a /48 for each 
> residential user appears a no-brainer.

I'm arguing that's the uncommon case and operators should
have a default prefix that's closer to the common case, but
have some mechanism for allocating to self-described power-users.
I could just about see a /56 by default, but not ever a /48 by
default for a single family dwelling.

A genuinely separate subnet is a management burden, which 
I'd guess that 95% or more of single family residential 
customers simply aren't looking for.

- Mark

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