[ipv6-wg] IPv6 residential service: What prefix, static, dynamic, extra cost ?

Hi,

On Thu, May 19, 2016 at 10:19:07AM +0200, Mikael Abrahamsson wrote:
> My opinion is that anything between /56 and /48 is fine. As far as I know, 
> current RIPE policy gives the ISP the option to without motivation, ask 
> for enough IPv6 addresses to offer each customer a /48 and I'd like to 
> keep it that way.

Right.  The reason why the address policy isn't fixed at "customer = /48"
anymore is because Geoff Huston did some math, "back then", and came to
the conclusion that IPv6 might actually be not sufficiently large if

  - every residential customer receives one or more /48s (multiple ISPs)
  - RIR->LIR policy has very liberal HD ratio  (so for large blocks
    you get 1:10000 or worse utilization ration)
  - every human on earth gets access to the Internet

so the policy was changed to make this a local decision, and sort of
recommend a /56 (but /48 is OK, and counted as "256 customers with /56"
when judging utilization)  (and tightened HD ratio somewhat).


With-no-hats, I think a /56 for residential is good enough, especially
with homenet coming to replace the old DHCP-PD hierarchical model where
you could end up with prefix shortage if you have router cascades, due
to protocol inflexibility ("/56 router delegating /60 -> delegating /64 
and then?").  With homenet, 250 subnets in the home would "just work"
given a /56, and I'm too narrow-minded to imagine deployments that need
more *subnets*.

Gert Doering
        -- APWG chair
-- 
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