[arin-ppml] Automatic IPv6 Eligibility

Owen DeLong owen at delong.com
Thu Aug 13 23:10:57 EDT 2015

> On Aug 13, 2015, at 15:59 , John Santos <JOHN at egh.com> wrote:
> Maybe off-topic, but the recommendation for assigning a /48 to each of
> the ISP's customers...  Does that apply only to business customers 
> and organizations, etc., or does it also apply to residential customers?
> Why would a residence (unless they're network hackers like most of us)
> ever need more than a /64, let alone 2^16 /64's?  I don't see any obvious 
> use case for people subnetting their house or appartment :-)

I believe it applies universally to all end sites, including residential customers.

I’m running a /48 in my home.

The question you are asking reflects a vision of the household as it is today.
A relatively flat network with a few devices on it.

The reality of tomorrow is going to be quite different. We don’t know exactly
what it will be. By giving residential end-users /48s, we have very near zero
risk of running out of IPv6 addresses (this has been rehashed many times
in many fora) and yet we allow for quite a bit of latitude for innovation in home

In the future, lots of things that aren’t routers today will, in fact, likely be routers
and they will likely create subnets behind them. This is one of the reasons to
have DHCP-PD.

> I'm sure this has been discussed to death here and elsewhere.  I've not
> yet been involved in any large-scale IPv6 deployments (just our lone LAN
> that easily fits in a IPv4 /24, and doesn't yet have any off-site IPv6
> connectivity), so I'm trying to internalize IPv6 best practices before
> screwing up too badly.

Do not make the mistake of engineering your IPv6 deployment to only meet your
past or present needs, but instead design it to be flexible and ready to meet
your future needs as well.


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