Current Consensus on IPv6 Customer Allocation Size

Gert Doering gert at
Thu Aug 2 12:44:44 CEST 2012


On Thu, Aug 02, 2012 at 12:31:19PM +0200, Mikael Abrahamsson wrote:
> On Thu, 2 Aug 2012, Mark Blackman wrote:
> > They're going to need a much bigger IPv6 allocation to give all ~2^26 
> > customers a /48 allocation, and they can't even quite give them all a 
> > /56 out of their current allocation.
> It gets interesting if every mobile device should get a /48 as well, then 
> we're going to be spending a /14 on this (2^34 is 16G, 48-34=14.

Something tells me that you're not having 16 *billion* customers, but
more like 16 *million*.  Right?  That's 2^24, plus some :-) -> /24-ish
needed to give out /48s

I'm not sure I expect to see /48 (or /56, for that matter) on any 
internet-enabled mobile device, though.  Most of them will be happy 
with a /64, as that's sufficient for providing WiFi access to your 
Laptop... only "mobile routers" (like, LTE based connectivity for your 
SoHo network, as an alternative to cable/dsl) will send DHCP-PD 
requests with a bigger request size...  but that's crystal balling, 
of course.

> Question, with growth and room for efficient routing, I'd imagine people 
> will need to start talking to their RIR to get larger subnets. Will the 
> RIRs accept these calculations and approve these sizes?

The RIPE NCC will generally do so, if the calculations make sense.  Up to 
a /29 can be had without any calculations[*], just by asking for it - so 
if you really need more, be prepared to have good numbers :-)

(*) and existing /32s can be extended up to a /29 by "just asking for it".

Gert Doering
        -- NetMaster
have you enabled IPv6 on something today...?

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