[Kea-users] Many to one Migration from ISC to Kea

[Kraishak Mahtha]

Hi Darren, thankyou for your response and suggestion

On Mon, Mar 30, 2026 at 5:29 PM Darren Ankney <darren.ankney at gmail.com>
wrote:

> Hello Kraishak,
>
> There is presently no way to replicate the load-balancing hub and
> spoke model from ISC DHCP.  I do not find any issues here:
>
> https://gitlab.isc.org/isc-projects/kea/-/issues?sort=created_date&state=opened&label_name%5B%5D=ha
> related to expanding the functionality of hub and spoke to include the
> load balancing mode.  Given that both servers in an HA relationship
> need to be capable of handling the full client, there isn't much
> advantage to load-balancing.  Have you considered implementing
> hot-standby, when you move to Kea, instead?
>
> Thank you,
> Darren Ankney
>
> On Mon, Mar 30, 2026 at 1:04 AM Kraishak Mahtha <kraishak.edu at gmail.com>
> wrote:
> >
> > Hi All,
> >
> > I am currently planning a migration from ISC DHCP to Kea DHCP due to
> ISC’s End-of-Life status. In my current ISC environment, I utilize a
> "Many-to-One" Active-Active (50/50 load balancing) architecture.
> >
> > My Current ISC Setup:
> > I have four servers where "Server-B" acts as a common secondary peer for
> three different primary servers:
> > * Failover-1: Server-A <—> Server-B
> > * Failover-2: Server-C <—> Server-B
> > * Failover-3: Server-D <—> Server-B
> >
> > This hub-and-spoke model is highly efficient for us; by assigning more
> resources to Server-B, we can handle traffic for three sites with only four
> server instances.
> >
> > The Challenge with Kea:
> > Based on my research, Kea’s Hub-and-Spoke model currently only supports
> Active-Passive (Hot-Standby). To achieve Active-Active load balancing in
> Kea, it appears I am limited to 1-to-1 pairs, which would require six
> server instances (three separate pairs) to achieve the same result. This
> significantly increases our infrastructure and resource management.
> >
> > Looking for some advice from the community:
> >
> > 1)Is there any way to achieve a Many-to-One Active-Active relationship
> in Kea using current stable versions
> >
> > 2)For those of you who moved from a similar ISC setup, how did you
> handle the jump from 4 servers to 6? Are there any middle-ground
> configurations I might have missed?
> >
> > 3)Does anyone know if the developers are considering adding Many-to-One
> Load Balancing to the roadmap, or is the architecture strictly staying
> One-to-One for now?
> >
> > I appreciate any guidance or insights from those who have faced similar
> multi-site migration challenges.
> >
> > Thanks in advance
> > Kraishak
> >
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