[Kea-users] Assigning unique /64 to each CPE for IA_NA

[Darren Ankney]

The simplest answer is found in the documentation:
https://kea.readthedocs.io/en/kea-2.2.0/arm/dhcp6-srv.html#subnet-and-prefix-delegation-pools
though your exact implementation may require slightly different
configurations (example: multiple prefix pools).  Example from the
documentation shown below with my comments relating it to the
recommendations you quoted.

"Dhcp6": {
    "subnet6": [
        {
            // this would be the subnet that the CPE will get on the WAN side
            "subnet": "2001:d8b:1::/64",
            "pd-pools": [
                {
                    // this is the subnet you are going to delegate
smaller portions of to the LAN side of the CPE
                    "prefix": "3000:1::",
                    // This is the length of the subnet that you are
going to delegate (example /48)
                    "prefix-len": 64,
                    // this is the size of the delegation you want to
give to the CPE (the recommendations you quoted said /64)
                    "delegated-len": 96
                }
            ]
        }
    ],
    ...
}



On Mon, Nov 28, 2022 at 5:42 AM Xuo Guoto via Kea-users
<kea-users at lists.isc.org> wrote:
>
> Hello Kea list,
>
> I am trying to configure kea-ipv6 in a BNG context where kea will be responsible for providing IP address for WAN (IA_NA) and for IA_PD. There is a requirement that when assigning IA_NA each Residential Gateway be given an IP address from a separate /64 prefix.
>
> For example  RIPE BCOP-690 section 4.1.1 says:
>
> <quote>
> Using a /64 prefix from a dedicated pool of IPv6 prefixes is the most common scenario and currently the best practice. A separate block of IPv6 space is allocated for the WAN links to the end customer CPEs, so that when CPE connects to the network and performs router discovery, a /64 prefix is used to number both ends of the connection.
> </quote>
>
> How such a configuration be provided in kea? From what I have seen if a /48 prefix is used in pool, kea will try to allocate single /128 to each CPE, and pd-pools are for IA_PD.
>
> Thanks for your help!
>
> X.
>
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