Hi Kraishak, Looking at your log file, it appears that "Server A" only saw one unacked client, so it didn't transform to a partner-down state. I see several HA_COMMUNICATION_INTERRUPTED_CLIENT4 messages but only one HA_COMMUNICATION_INTERRUPTED_CLIENT4_UNACKED message.
2023-05-15 16:07:30.127 INFO [kea-dhcp4.ha-hooks/32411.139751579436800] HA_COMMUNICATION_INTERRUPTED_CLIENT4_UNACKED [hwtype=1 34:98:b5:dc:1f:99], cid=[no info], tid=0x4be21c7f: partner server failed to respond, 1 clients unacked so far, 13 clients left before transitioning to the partner-down state Your configuration contains the following statement: "max-unacked-clients": 13 The "max-ack-delay" parameter has a default value of 10000 ms. I suggest you check that your traffic generator correctly increments the "secs" field and to modify your HA settings appropriately. >From the Kea ARM: HA_COMMUNICATION_INTERRUPTED_CLIENT4 %1: new client attempting to get a lease from the partner This informational message is issued when the surviving server observes a DHCP packet sent to the partner with which the communication is interrupted. The the client whose packet is observed is not yet considered “unacked” because the secs field value does not exceed the configured threshold specified with max-ack-delay. HA_COMMUNICATION_INTERRUPTED_CLIENT4_UNACKED %1: partner server failed to respond, %2 clients unacked so far, %3 clients left before transitioning to the partner-down state This informational message is issued when the surviving server determines that its partner failed to respond to the DHCP query and that this client is considered to not be served by the partner. The surviving server counts such clients, and if the number of such clients exceeds the max-unacked-clients threshold, the server will transition to the partner-down state. The first argument contains client identification information. The second argument specifies the number of clients to which the server has failed to respond. The third argument specifies the number of additional clients, which, if not provisioned, will cause the server to transition to the partner-down state. Kind Regards Peter
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