Hi Diogo,

You haven't missed anything.  This is the current intended behavior.
There is a new Gitlab issue about this here:
https://gitlab.isc.org/isc-projects/kea/-/issues/3790 that may
interest you.

Thank you,
Darren Ankney

On Mon, Mar 10, 2025 at 8:46 PM Diogo André de Assumpção via Kea-users
<kea-users@lists.isc.org> wrote:
>
> Hi All,
>
> I’m evaluating possible failure scenarios with Kea (currently testing with 
> version 2.2.1). One specific scenario I’m going through is with two servers 
> set up as load-balancing HA pair. Some setup details:
>
> - Servers are hosted at different locations
> - Clients are in a third location, using relays to interact with DHCP
> - Using MT and dedicated listener
> - Servers1 and Server2 are able to communicate and exchanged  heartbeats 
> without interruptions
> - Clients can obtain v4 and v6 addresses and classification is even
>
> What I’m testing:
>
> Network failure scenario where Server2 is no longer receiving DHCP traffic 
> from relays. Server 1 continues to receive traffic from relays. Servers 1 and 
> 2 continue to receive heartbeats from peer.
>
> In a scenario like this, I expected that server1 would detect a partner down 
> due `secs` or  `elapsed-time` exceeding `max-ack-delay`, and 
> `max-unacked-clients` also exceeding the max value set. But I’m not seeing 
> that and clients that were previously classified and allotted to server2 do 
> not receive any DHCP response after the simulated network failure.
>
> Is it a wrong assumption? Am I missing something in the configuration?
>
> Sample config attached.
>
>
> Thanks,
> – Diogo
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