[Kea-users] Kea-upgrading from 2.6 to the latest

[Doug Freed]

On 3/20/26 08:44, Kraishak Mahtha wrote:
> Hi Peter, Thanks for responding. So, basically, I have these doubts
> The client-class definition inside the pool was previously one line, now 
> in the latest version. I see that the client class is a set of 
> ArrayLists, so can we mention the comma-separated classes,
> like let's say I have two pools configured in load balancing mode, where 
> I want to associate pool-1 with clientclassPhones and pool-2 to 
> associate with clientclassLaptop can we configure it like below
>   "pools": [
>              {
>                  "client-classes": ["HA_dev-ipv4-stack-remote-20", 
> "clientclassPhones"]
>                  "pool": "14.0.0.12-14.0.0.19"
>              },
>              {
>                  "client-classes": ["HA_kea-dhcp-21", "clientclassLaptop"]
>                  "pool": "14.0.0.2-14.0.0.9"
>              }
>          ],
> 
> 
> On Fri, Mar 20, 2026 at 4:36 PM Peter Davies <peterd at isc.org 
> <mailto:peterd at isc.org>> wrote:
> 
>     Hi Kraishak,
>          HA's Hub and Spoke configuration is designed to support multiple
>     "hot-standby"
>     HA relationships.
> 
>     If you attempt to define multiple "load-balancing" relationships, Kea
>     will exit
>     with the following message:
> 
>     “HA_CONFIGURATION_FAILED failed to configure High Availability hooks
>     library: multiple HA relationships are only supported for 'hot-standby'
>     mode”
> 
>     For configurations examples: see:
>     https://kea.readthedocs.io/en/latest/arm/hooks.html#hub-and-spoke-
>     configuration <https://kea.readthedocs.io/en/latest/arm/
>     hooks.html#hub-and-spoke-configuration>
> 
>     /Peter
> 
>     -- 
>     Peter Davies
>     Support Engineer
> 
>     -- 
>     ISC funds the development of this software with paid support
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> 
> 

Note that this configuration will not work like you expect.  The 
"client-classes" setting is an implicit "OR" operation.  A client is 
allowed to use the pool if they have any of the classes in the list.  In 
order to make an "AND" operation of the server handling the client and 
your laptop vs phone split, you would need 4 pools and 4 classes.  Each 
class can just test for membership in 1 HA server class and either 
laptop or phone class, and then set each pool's "client-classes" to one 
of these classes.

-Doug