[Kea-users] DHCPv4 lease reservation based on host name (option 12)

[Chaigneau, Nicolas]

Hello,


I would like to implement the following feature with Kea :
Based on DHCPv4 option < host name > (12) provided by clients in DHCP requests, assign a reserved lease IP address.

Reading Kea documentation, I see that the < reservations > entries can have a < hostname > field.
However (if I understand correctly) this is not used as a matching criteria on the request, but rather as information to be provided in the response.
Can you confirm ?


If so, I think the < flex-id > commercial hook would be the solution to my requirement.
For example with the following configuration, I would be able to reserve the lease 10.0.0.7 to a client that provides < my.host > in DHCP option < host name > (12).
This IP address 10.0.0.7 would never be assigned to any other client.
Can you confirm this is correct ?


"Dhcp4": {
    "subnet4": [ { ...,
    "reservations": [
      {
        "flex-id": "my.host",
        "ip-address": "10.0.0.7"
      }
    ],
    } ], # end of subnet definitions
    "host-reservation-identifiers": ["flex-id"],
    "hooks-libraries": [
        {
            "library": "/path/libdhcp_flex_id.so",
            "parameters": {
                "identifier-expression": "option[12]"
            }
        }
    ]
}



Lastly, I would like to know if it is possible to obtain an evaluation version of the < flex-id > commercial hook, to perform some tests ?



Thanks for your answers. :)


Regards,
Nicolas.

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