[Kea-users] Question about Stork subnet address counting and high-usage warning

[Darren Ankney]

Hi Oliver,

My understanding is that this is expected.  Your dynamic pool is the
only usable part.  Then the reservation assigned addresses outside of
the dynamic pool are added to the count.  It is fuzzy to me whether
these are only added if in-use, or assigned is enough, or exactly how
that works, but they are added.  There is a dedicated Stork users
mailing list, you might have better luck with more detail there:
https://lists.isc.org/mailman/listinfo/stork-users

Thank you,
Darren Ankney

On Fri, Dec 5, 2025 at 8:25 AM Oliver <ofabelo at gmail.com> wrote:
>
> Hi everyone,
>
> I’m running Kea DHCP4 together with Stork, and I’ve encountered something I don’t fully understand regarding how Stork calculates the total number of addresses in a subnet.
>
> I have a 1XX.9.3.0/24 subnet configured, with only a very small dynamic pool:
>
> pools:
>   - pool: 1XX.9.3.250-1XX.9.3.254
>
> All other addresses in the /24 are used exclusively as static host reservations.
>
> However, Stork reports the following:
>
> Total addresses: 62
>
> Assigned: 51
>
> Free: 11
>
> Usage: 82.3% (yellow warning shown)
>
> My question is:
>
> Why does Stork calculate only 62 total usable addresses for this subnet, when the subnet is actually a full /24?
>
> I understand that my dynamic pool only contains 5 addresses, but I expected Stork to consider the rest of the /24 as part of the subnet, since I use those addresses for reservations.
>
> Is this the expected behavior?
> Does Stork count only “usable” addresses as those inside dynamic pools plus explicitly configured reservations?
> Is there a recommended way to have Stork recognize the entire /24 range so it doesn’t trigger a high-usage warning?
>
> Operationally everything works fine — I can continue creating reservations without any issue — but I’d like to confirm whether this behavior is normal or whether I might be missing something in the configuration.
>
> Thanks in advance,
> Oliver
>
>
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