[Kea-users] Dropping the packets in load balancing

[Peter Davies]

Hi Kraishak, 
This behaviour is expected when HA is configured in "load-balancing" mode. 

Under normal operations, the two Kea servers divide the clients between them. 

The server decides which clients they need to respond to based on a hash of the 
client identifier; this is often the client's Mac address. The split is 50/50. 

Kind Regards Peter 


From: "Kraishak Mahtha" <kraishak.edu at gmail.com> 
To: "Kea-users at lists.isc.org" <kea-users at lists.isc.org> 
Sent: Wednesday, 10 May, 2023 08:45:08 
Subject: [Kea-users] Dropping the packets in load balancing 

Hi all, 
I have configured the kea-HA in load-balancing mode, and I am testing the flow by hitting the discover packets only to the primary server using my lease test tool but I see a few of the packets get dropped or have not been seen. 

When I see the log I see as: 
HA_BUFFER4_RECEIVE_NOT_FOR_US [hwtype=1 82:ff:ff:00:00:01], cid=[01:82:ff:ff:00:00:01], tid=0x29652559: dropping query to be processed by another server 

I have a few doubts about this 
1)I have only 10 active leases in the given scope range and we still have so many free leases then why does the server drop the query and hand it over to its peer? 
2)Do we need to add any parameters in the config file to make the kea-DHCP primary to forcefully check its all free available IPs? 

Thanks in advance 
Kraishak 


Attached are my kea-dhcp configs of primary and failover 

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