[Kea-users] from isc dhcp classes -> kea 3.0

[Gregor Kling]

Hi Darren,


On 11/19/25 3:58 PM, Darren Ankney wrote:
> Hi Gregor,
>
> That *should* work, but you don't have to do it that way.  You could
> specify the reservation globally, set `"reservations-global": true`
> (https://kea.readthedocs.io/en/stable/arm/dhcp4-srv.html#fine-tuning-dhcpv4-host-reservation)
> and specify whatever classes are necessary in "client-classes" so that
> you would only need to have one entry per client.  This may reduce
> performance but see here: https://reports.kea.isc.org/ for Kea
> performance numbers, perhaps it is not a concern?

Actually this is the part where i am right now trying to wrap my head 
around.

It is totally unclear to me if reservations-in-subnet or
reservations-global is what i should use.

I guess you will hear from me for this one as well :)


gg


> Thank you,
> Darren Ankney
>
> On Wed, Nov 19, 2025 at 4:16 AM Gregor Kling <gregor.kling at its.thm.de> wrote:
>> Hello,
>>
>>
>> On 11/18/25 10:13 AM, Gregor Kling wrote:
>>> If i am understanding correctly, i'll have to to put
>>>
>>> #+begin_quote
>>>   "hw-address": "a1:bb:cc:dd:ee:ff",
>>>   "client-classes": [ "pool_name_1", "pool_name_etc" ]
>>> #+end_quote
>>>
>>> (without ip-address) in every subnet reservations block where i want
>>> to have the system with the mac address: "a1:bb:cc:dd:ee:ff"
>>> get an address from the "matching" dynamic pool?
>>>
>> To answer myself:
>>
>> https://kea.readthedocs.io/en/kea-3.0.2/arm/dhcp4-srv.html#host-reservations-in-dhcpv4
>>
>>
>> is clear about that:
>>
>> #+begin_quote
>> Making a reservation for a mobile host that may visit multiple subnets
>> requires a separate host definition in each subnet that host is expected
>> to visit. It is not possible to define multiple host definitions with
>> the same hardware address in a single subnet. Multiple host definitions
>> with the same hardware address are valid if each is in a different subnet.
>> #+end_quote
>>
>>
>> gg
>>
>> --
>> Gregor Kling
>>
>> Abteilung ITS, Sachgebiet ITS-N
>> Technische Hochschule Mittelhessen
>> University of Applied Sciences
>> Tel: 0641/309-1292
>> E-Mail: gregor.kling at its.thm.de
>>
>> --
>> ISC funds the development of this software with paid support subscriptions. Contact us at https://www.isc.org/contact/ for more information.
>>
>> To unsubscribe visit https://lists.isc.org/mailman/listinfo/kea-users.
>> Kea-users at lists.isc.org

-- 
Gregor Kling

Abteilung ITS, Sachgebiet ITS-N
Technische Hochschule Mittelhessen
University of Applied Sciences
Tel: 0641/309-1292
E-Mail: gregor.kling at its.thm.de

-------------- next part --------------
A non-text attachment was scrubbed...
Name: smime.p7s
Type: application/pkcs7-signature
Size: 4684 bytes
Desc: S/MIME Cryptographic Signature
URL: <https://lists.isc.org/pipermail/kea-users/attachments/20251120/b4992f11/attachment.p7s>