[AusNOG] another ipv6 Q

[Karl Auer]

On Thu, 2014-07-03 at 15:47 +1000, Tony wrote:
> * We allocate a /48 (out of our /32 that we have from APNIC) to customer
> * customer splits this up as they see fit (hopefully following some rules  
> as to how they allocate subnets)
> * customer gives devices an IPv6 address out of this /48 on all their  
> devices
> * all customer devices are now globally addressable
> 
> So what happens when said customer changes to another SP ?

What the customer did was get provider aggregatable (PA) address space.
It was probably very cheap, probably even free, but the downside is that
it is tied to the particular provider. If they change providers, they
will have to renumber.

> The alternative could be the customer  
> approaches the LIR and gains a /48 from the LIR,

That's "provider independent" (PI) AKA "portable" address space.

>  but wouldn't you then  
> just have every company in the world with their own /48 which would just  
> cause issues with aggregation and routing table size ?

Well, yes and no. PI is the solution for someone who needs multihoming
or who wants portability. There are lots of people who will be happy to
use PA, not least because it is usually very cheap. PA will be certainly
be the default for millions upon millions of homes and small businesses,
just as it is now. Also, renumbering isn't quite the horrible bugbear it
used to be, especially if you design with possible renumbering in mind.
There are other solutions if they really want to push it (1:1 NAT with
ULA etc) but none have much to recommend them over nice clean PI address
space, if renumbering is so deeply feared (or so very likely).

> In the IPv4 world, this would mean changing DHCP  
> scopes, then changing anything that is manually set ?

Same for IPv6.

> I'm just curious as for anyone who isn't able to get their own globally  
> unique space from a LIR then does [...]

The predicate is wrong. Why would someone not be able to get PI? There
is a metric shitload of it available.

Regards, K.

-- 
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Karl Auer (kauer at biplane.com.au)
http://www.biplane.com.au/kauer
http://twitter.com/kauer389

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