[Kea-users] Expire single IP

[DDFR | Ronald Blaas]

Hi Darren,

This looks very promising!

Can we use this method per subnet ?
Our DHCP server provides services for multiple subnets.

Regards,

Ronald



________________________________
From: Kea-users <kea-users-bounces at lists.isc.org> on behalf of Darren Ankney <darren.ankney at gmail.com>
Sent: Thursday, September 4, 2025 13:46
To: Kea user's list <kea-users at lists.isc.org>
Subject: Re: [Kea-users] Expire single IP

Hi Ronald,

Have a look at the flex_id hook
(https://eur05.safelinks.protection.outlook.com/?url=https%3A%2F%2Fkea.readthedocs.io%2Fen%2Fkea-3.0.1%2Farm%2Fhooks.html%23libdhcp-flex-id-so-flexible-identifier-for-host-reservations&data=05%7C02%7Cronald.blaas%40ddfr.nl%7C5a1dcd6ef3c24fce7cf108ddeba8ce9c%7C61b60fb772d74ba78225d9b5369d780a%7C0%7C0%7C638925832430964097%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=PNMBxikdl1Vu4%2BTR5eQJohhcRzGVyQlJgNEw%2B5o5m9k%3D&reserved=0<https://kea.readthedocs.io/en/kea-3.0.1/arm/hooks.html#libdhcp-flex-id-so-flexible-identifier-for-host-reservations>).
You can combine this with the replace-client-id flag
(https://eur05.safelinks.protection.outlook.com/?url=https%3A%2F%2Fkea.readthedocs.io%2Fen%2Fkea-3.0.1%2Farm%2Fhooks.html%23the-replace-client-id-flag&data=05%7C02%7Cronald.blaas%40ddfr.nl%7C5a1dcd6ef3c24fce7cf108ddeba8ce9c%7C61b60fb772d74ba78225d9b5369d780a%7C0%7C0%7C638925832431194932%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=0aKG0pGdkRiLes5YN7hSFRbwKvj%2BGQaPzkbSiu3KTOI%3D&reserved=0<https://kea.readthedocs.io/en/kea-3.0.1/arm/hooks.html#the-replace-client-id-flag>)
so that the lease is recorded by option 82 as well (i.e., the
client-id in the lease is replaced with the option82 hex).  In this
way, Kea will effectively be unaware that the client has changed.

Thank you,
Darren Ankney

On Wed, Sep 3, 2025 at 9:16 AM DDFR | Ronald Blaas <ronald.blaas at ddfr.nl> wrote:
>
> Hi all
>
> I was wondering if we could expire a single ip address after 1 hour (or maybe less)
>
>
> The reason for this is we have a port on which we connect different devices but the same IP address (is assigned via Option82)
>
> With the IP address in the database it is locked so the second device gets an IP from the pool.
>
>
> Ofcourse we can release the IP but I was wondering if this can be automated so the the IP is Expired sooner
>
>
> Kind regard,
>
>
> Ronald
>
>
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