[Kea-users] Dhcp6 Prefix Exclude use case question

[Dan Geist]

Greetings, all. I'm exploring using the "prefix exclude" feature to do something a little different than what it's RFC describes and would like to know if my scenario would work. In the kea ARM, the example config is as follows:

"Dhcp6": {
    "subnet6": [
        {
            "subnet": "2001:db8:1::/48",
            "pd-pools": [
                {
                    "prefix": "2001:db8:1:8000::",
                    "prefix-len": 56,
                    "delegated-len": 64,
                    "excluded-prefix": "2001:db8:1:8000:cafe:80::",
                    "excluded-prefix-len": 72
                }
            ]
        }
    ]
}

This allows a device that sends a Prefix Exclude option to be allocated the indicated /72.

In my environment, we'd like to be able to allocate PDs from a block that is discrete from the subnet and in which the very first PD is NEVER assigned, ala:

"Dhcp6": {
    "subnet6": [
        {
            "subnet": "2001:db8:1::/48",
            "pd-pools": [
                {
                    "prefix": "2001:db8:2::",
                    "prefix-len": 48,
                    "delegated-len": 60,
                    "excluded-prefix": "2001:db8:2::",
                    "excluded-prefix-len": 60
                }
            ]
        }
    ]
}

Assuming I don't have any dhcpv6 endpoint devices sending the excluded prefix option, does this accomplish what I'm attempting, which is: never use the first /60 from the PD /48 prefix?

Thanks
Dan

-- 
Dan Geist dan(@)polter.net