[Kea-users] Configuring HA with multiple interfaces on both the appliances

[Rick Frey]

You can have different number of listening interfaces for HA pair (assuming they are able to receive requests for all subnets).  The “url” directive in the HA hook configuration is for the Control-Agent (CA).  The addr/port of the Control-Agent is independent of the DHCP4 server and is specified in its config (kea-ctrl-agent.conf).  The address for the Control-Agent can be different than address(es) you configure for the DHCP4 server.

> On Oct 16, 2023, at 8:37 AM, Kraishak Mahtha <kraishak.edu at gmail.com> wrote:
> 
> Hi all, 
> 
> Re-sending the mail once again to check if anyone is familiar with this case, and can guide me. 
> 
> On Tue, Oct 3, 2023 at 12:32 PM Kraishak Mahtha <kraishak.edu at gmail.com <mailto:kraishak.edu at gmail.com>> wrote:
>>  Hi all, 
>>  I have a few doubts in a case where we have multiple interfaces listening in the kea dhcp and configured in HA/Failover mode.
>> For instance: I have server A with four interfaces
>>  eth0 (192.168.0.51), eth1 (192.168.0.52), eth2 (192.168.0.53), eth3 (192.168.0.54) and server B I have three interfaces
>> eth1(192.168.0.61), eth2(192.168.0.62), eth2(192.168.0.63).
>> 
>> Case 1) Can we define failover configuration with servers A and B specifying server A listening on three interfaces and server B listening on two interfaces? (no same number of interfaces on both appliances).
>> 
>> Case 2) When we have such a configuration how do we deal with the failover configuration where we specify only one IP?
>> "peers": [
>>             {
>>                 "role": "primary",
>>                 "name": "dhcp1",
>>                 "auto-failover": true,
>>                 "url": "http://192.168.0.51:8001 <http://192.168.0.51:8001/>"
>>             },
>>             {
>>                 "role": "secondary",
>>                 "name": "dhcp2",
>>                 "auto-failover": true,
>>                 "url": "http://192.168.0.61:8001 <http://192.168.0.61:8001/>"
>>             }
>>        ],
>> Should we specify all the listening interface IP's in the failover section? 
>> 
>> Can someone who is familiar with such setups and has faced similar issues guide me? 
>> 
>> Thanks in Advance
>> Kraishak 
>> 
>> 
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