[Kea-users] Question regarding to kea configuration in memory

[Darren Ankney]

Hi,

Please share what version of Kea you are using.  Not only did the
class name change, but the statement became a list (client-class vs
client-classes).  Suspect you might be using a dev version as that
feature has not been released in stable.  There could be some bug
there, though I am unsure why an _class2 would be added in this case.
Do you have a "device" or "device_class2" defined in client-classes
(not in the subnet but an actual class definition)?

Thank you,
Darren Ankney

On Thu, Apr 17, 2025 at 5:23 PM tachibanashita at outlook.com
<tachibanashita at outlook.com> wrote:
>
> Greetings,
>
> I have a subnet definition in my kea-dhcp6.conf, it inherited its configuration from a client class called “device”, then I gave it some customization configuration in the option-data section. After I used the config-write command to get the config from memory, I noticed the client class of this subbed is no longer “device” but “device_class2”, even I never defined this client class. My guess is because of the customization data in option-data section, so kea realized its configuration is different from the original client class “device”, and it gives a new name.
>
> Is this behavior expected? I think this could bring some troubles when we try to do automatization. Now after we use the subnet hook, we have to use the config-write command Darren mentioned to save the config changes from memory to harddisk. And now in the new config file, we will have those “device_class2” client class which previously didn’t exist.
>
>
> Original config in kea-dhcp6.conf:
>
>         {
>             "id": 2,
>             "subnet": "2100:100:10:10::1/64",
>             "option-data": [
>                {
>                     "space": "vendor-4491",
>                     "name": "cores",
>                     "code": 61,
>                     "data": "2100:100:10:10::10-2100:100:10:10::100",
>                     "always-send": true
>                }
>             ],
>             "pools": [
>                 {
>                     "pool": "2100:100:10:10::10-2100:100:10:10::100"
>                 }
>              ],
>             "relay": {
>                 "ip-addresses": [ "2100:100:10:10::1" ]
>              },
>             "interface": "ens2",
>             "client-class": “device",
>             "allocator": "iterative"
>         },
>
>
> After using config-write:
>       {
>         "allocator": "iterative",
>         "calculate-tee-times": true,
>         "client-classes": [ “device_class2" ],
>         "id": 2,
>         "interface": "ens2",
>         "max-preferred-lifetime": 907200,
>         "max-valid-lifetime": 1209600,
>         "min-preferred-lifetime": 907200,
>         "min-valid-lifetime": 1209600,
>         "option-data": [
>           {
>             "always-send": true,
>             "code": 61,
>             "csv-format": true,
>             "data": “2100:100:0:30:0:0:0:22",
>             "name": "cores",
>             "never-send": false,
>             "space": "vendor-4491"
>           }
>         ],
>         "pd-allocator": "iterative",
>         "pd-pools": [ ],
>         "pools": [
>           {
>             "option-data": [ ],
>             "pool": “2100:100:10:10::10-2100:100:10:10::100"
>           }
>         ],
>         "preferred-lifetime": 907200,
>         "rapid-commit": false,
>         "rebind-timer": 1058400,
>         "relay": {
>           "ip-addresses": [ "2100:100:10:10::1" ]
>         },
>         "renew-timer": 604800,
>         "reservations": [ ],
>         "store-extended-info": false,
>         "subnet": "2100:100:10:10::1/64",
>         "t1-percent": 0.5,
>         "t2-percent": 0.8,
>         "valid-lifetime": 1209600
>       },
> --
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