Re: Dual stack IPv6 for IPv4 depletion

[Dave Taht <dave.taht () gmail com>]

On Thu, Jul 9, 2015 at 9:01 AM, Harald Koch <chk () pobox com> wrote:
> On 9 July 2015 at 11:42, Matthew Huff <mhuff () ox com> wrote:
>
> > What am I missing? Is it just the splitting on the sextet boundary that is
> > an issue, or do people think people really need 64k subnets per household?

It is wasting that /64 on each separate media, lan type, or security model.

> >
>
> One thing you're missing is that some of these new-fangled uses for IP
> networking will want to do their own subnetting. It's not "here's a subnet
> for the car", it's "here's a /56 for the car to break into smaller pieces
> as required".
>
> A /56 isn't 256 subnets, it's 8 levels of subnetting (or 2 levels, if
> you're human and want to subnet at nibble boundaries). A /48 is 16 (or 4)
> levels. I have four vehicles, so I'd want to carve out a /52 for "the car
> network" to make the routing and security easier to manage, and leave room
> for expansion (or for my guests...)
>
> One more consideration for you: we're currently allocating all IPv6
> addresses out of 2000::/3. That's 1/8th of the space available. If we
> discover we've messed up with this sparse address allocation idea, we have
> 7/8ths of the remaining space left to do something different.

And the colonists of Alpha Centauri will curse our shortsightedness.

> --
> Harald



-- 
Dave Täht
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