[ipv6-wg] RE: [address-policy-wg] IPv6 allocations for 6RD

Hi Jan,

I see the problem you have trying to get a fragmented address space such
as yours play nicely with 6rd. However, given the dimension of your
network (some quick digging gave me a figure of roughly a million v4
addresses) do you think that asking for 4 billion /60 prefixes is a good
idea? To borrow somebody else's words here, that doesn't scale. 

Here's another idea. You've got ~135 prefixes announced, but if I
aggregate those to the nearest /16 (remember, if there are blocks of
space that aren't yours in between it doesn't matter for 6rd because the
ipv6 sp prefix will be different anyway) you end up with a (sparsely
filled) block or 30. From there on it's a matter of a simple mapping to
about 21 bits of uniquely identified addresses, removing an easy 3
orders of magnitude from your address requirement. All of a sudden, you
no longer need to have a /28 for just migrating your v4 customers but a
mere /39, giving you tons of space for deployment of new and exciting
IPv6 services for years even with the standard /32 allocation.

Since we're talking about drafts, not standards, perhaps something like
this should be taken in consideration reviewing a new version of the
draft. We've wasted enough IPv6 space in standards already, IMNSHO.

Best,

Remco

-----Original Message-----
From: address-policy-wg-admin at ripe.net
[mailto:address-policy-wg-admin at ripe.net] On Behalf Of Jan Boogman
Sent: woensdag 25 november 2009 17:13
To: Sander Steffann
Cc: address-policy-wg at ripe.net; ipv6-wg at ripe.net
Subject: Re: [address-policy-wg] IPv6 allocations for 6RD

Hi Sander

>> We asked RIPE NCC for a larger than /32 allocation (because of the
way how
>> 6RD encapsulates the customers IPv4 address in his IPv6 address and
also
>> because we want to give the customer a small subnet).
> 
> In draft-townsley-ipv6-6rd-01 the following example is given:
> 
> This example show how the 6rd prefix is created based on a /32 IPv6
prefix
> with a private IPv4 address were the first octet is "compressed" out:
>  SP prefix: 2001:0DB8::/32
>  6rd IPv4 prefix: 10.0.0.0/8
>  6rd router IPv4 address: 10.100.100.1
>  6rd site IPv6 prefix: 2001:0DB8:6464:0100::/56
> 
> With this scheme you can still give every customer out of an IPv4 /8
an
> IPv6 /56 subnet. If you have an IPv4 /16 with customers you could
> "compress" so that every customer has an IPv6 /48. And if you have
more
> than 65k customers you should have no problem with getting a bigger
IPv6
> allocation.

> 
> Because the IPRA refuses to give you more addresses based on your
customer
> base I suspect that you have less than 65k customers. With a smart
IPv4
> <--> IPv6-RD mapping that should not be a problem for IPv6-RD.
> 
> Can you give some extra background information that explains why you
need
> more than a /32?

we have much more than 65k customers, with IPv4 addresses dispersed in
many different /8
We therefore cannot easily compress the IPv4 address and want to use the
whole 32bit. 
However, we plan to allocate only a /60 subnet to the end customer.
This results in a request for a /28

Jan


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