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

Hi Jan,

> 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?

- Sander