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Hi Darren,</div>
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This looks very promising!</div>
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<br>
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Can we use this method per subnet ? </div>
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Our DHCP server provides services for multiple subnets. </div>
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Regards,</div>
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Ronald</div>
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<b>From:</b> Kea-users <kea-users-bounces@lists.isc.org> on behalf of Darren Ankney <darren.ankney@gmail.com><br>
<b>Sent:</b> Thursday, September 4, 2025 13:46<br>
<b>To:</b> Kea user's list <kea-users@lists.isc.org><br>
<b>Subject:</b> Re: [Kea-users] Expire single IP</div>
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<div style="font-size: 11pt;">Hi Ronald,<br>
<br>
Have a look at the flex_id hook<br>
(<a data-auth="NotApplicable" class="OWAAutoLink" id="OWAc1e8f020-e252-7505-97a1-e107ea4b520d" href="https://kea.readthedocs.io/en/kea-3.0.1/arm/hooks.html#libdhcp-flex-id-so-flexible-identifier-for-host-reservations">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</a>).<br>
You can combine this with the replace-client-id flag<br>
(<a data-auth="NotApplicable" class="OWAAutoLink" id="OWA971c1a4f-1f1a-edb9-1e3a-0f609d27b87a" href="https://kea.readthedocs.io/en/kea-3.0.1/arm/hooks.html#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</a>)<br>
so that the lease is recorded by option 82 as well (i.e., the<br>
client-id in the lease is replaced with the option82 hex). In this<br>
way, Kea will effectively be unaware that the client has changed.<br>
<br>
Thank you,<br>
Darren Ankney<br>
<br>
On Wed, Sep 3, 2025 at 9:16 AM DDFR | Ronald Blaas <ronald.blaas@ddfr.nl> wrote:<br>
><br>
> Hi all<br>
><br>
> I was wondering if we could expire a single ip address after 1 hour (or maybe less)<br>
><br>
><br>
> The reason for this is we have a port on which we connect different devices but the same IP address (is assigned via Option82)<br>
><br>
> With the IP address in the database it is locked so the second device gets an IP from the pool.<br>
><br>
><br>
> Ofcourse we can release the IP but I was wondering if this can be automated so the the IP is Expired sooner<br>
><br>
><br>
> Kind regard,<br>
><br>
><br>
> Ronald<br>
><br>
><br>
> --<br>
> ISC funds the development of this software with paid support subscriptions. Contact us at
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