[address-policy-wg] IPv6 allocations for 6RD
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Sander Steffann
sander at steffann.nl
Wed Nov 25 17:02:12 CET 2009
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
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