[Kea-users] kea-dhcp failover not working

[Darren Ankney]

Hui Kraishak,

The first thing I see is that your failover configs aren't exactly the
same.  They have two differences that I see:

"max-unacked-clients": 5,
vs
"max-unacked-clients": 0,

and

"url": "http://192.168.0.169:8000/",
vs
"url": "http://192.168.0.126:8000/",

You really want those configurations to be the same except the
"this-server-name":  portion.

I also see that the "url": "http://192.168.0.169:8000/", on the
primary (in the standby server slot) does not match what you are
listening to in your control agent on the standby server:

"http-host": "192.168.0.126",
        "http-port": 8000,

I imagine if you fix that typo, it will begin to work.

Thank you,

Darren Ankney

On Tue, Apr 18, 2023 at 1:38 PM Kraishak Mahtha <kraishak.edu at gmail.com> wrote:
>
> Hi Kevin,
>
> We have that setup already, I use a tool that send packets using the 4.0.0.0 network interface, I tried that in standalone and it worked fine. I have been using that tool for years and to my knowledge that has no issues, I also tried with 192.168.0.0/22 network too, but still no luck.
>
> And when you observe the echo command output file on both primary and failover it shows waiting, I guess that is causing the issue , I think it is something like both in recover recover status just like as ISC failover stages, may be I could be wrong too.
>
> Do you have any suggestions of how to debug more about the HA, Can we add any more debugging for HA flow ?
>
> On Tue, 18 Apr 2023 at 10:13 PM, Kevin P. Fleming <lists.kea-users at kevin.km6g.us> wrote:
>>
>> On Tue, Apr 18, 2023, at 12:26, Kraishak Mahtha wrote:
>>
>> Hi,
>> I am trying to configure the kea-DHCP failover.
>> Initially, I ran two DHCP servers as two separate standalone and tested the DHCP leases. It is working fine but when I add that to the failover type it is not working. unable to get leases.
>> I tried checking the logs, netstat, and config of both dhcp4 and the control agent, everything seems to be ok. I am not sure where the service is getting stuck, I have attached the required config files and "status-get" command output, can someone guide me on this
>>
>>
>> Your servers are on 192.168.0.0/24, but the subnet you have configured is 4.0.0.0/16. How are you sending the DHCP traffic from the clients to your servers, is there a relay involved? If so, is it sending the traffic to both servers in parallel?
>>
>>
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