Hi Ronald, The identifier expression uses the classification expression logic (see here: https://kea.readthedocs.io/en/kea-3.0.1/arm/classify.html#classification-using-expressions). If you're client DHCP traffic is relayed, consider using the giaddr (pkt4.giaddr) in the expression.
Thank you, Darren Ankney On Thu, Sep 4, 2025 at 8:38 AM DDFR | Ronald Blaas <[email protected]> wrote: > > 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 <[email protected]> on behalf of Darren Ankney > <[email protected]> > Sent: Thursday, September 4, 2025 13:46 > To: Kea user's list <[email protected]> > 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). > 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) > 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 <[email protected]> > 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 > > > > > > -- > > ISC funds the development of this software with paid support subscriptions. > > Contact us at > > https://eur05.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.isc.org%2Fcontact%2F&data=05%7C02%7Cronald.blaas%40ddfr.nl%7C5a1dcd6ef3c24fce7cf108ddeba8ce9c%7C61b60fb772d74ba78225d9b5369d780a%7C0%7C0%7C638925832431212731%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=B4URlT48EBJtkkcgHE4vIR1O%2Bjg18JyIC%2FJ3FgADCNI%3D&reserved=0 > > for more information. > > > > To unsubscribe visit > > https://eur05.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.isc.org%2Fmailman%2Flistinfo%2Fkea-users&data=05%7C02%7Cronald.blaas%40ddfr.nl%7C5a1dcd6ef3c24fce7cf108ddeba8ce9c%7C61b60fb772d74ba78225d9b5369d780a%7C0%7C0%7C638925832431229230%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=f1Z%2Bh6t%2FE7ReGfEErPz2XfoqdLf1HYkRe4ZAY9lEAV4%3D&reserved=0. > > [email protected] > -- > ISC funds the development of this software with paid support subscriptions. > Contact us at > https://eur05.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.isc.org%2Fcontact%2F&data=05%7C02%7Cronald.blaas%40ddfr.nl%7C5a1dcd6ef3c24fce7cf108ddeba8ce9c%7C61b60fb772d74ba78225d9b5369d780a%7C0%7C0%7C638925832431246187%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=cV8imEG6Y7BJUibVfDB2plQMCMbT78eZgsnGyRt8RGg%3D&reserved=0 > for more information. > > To unsubscribe visit > https://eur05.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.isc.org%2Fmailman%2Flistinfo%2Fkea-users&data=05%7C02%7Cronald.blaas%40ddfr.nl%7C5a1dcd6ef3c24fce7cf108ddeba8ce9c%7C61b60fb772d74ba78225d9b5369d780a%7C0%7C0%7C638925832431262495%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=nSinAR830OOm3cyqW89moxygwaVYwkXIo8f7F7kgh1A%3D&reserved=0. > [email protected] > -- > ISC funds the development of this software with paid support subscriptions. > Contact us at https://www.isc.org/contact/ for more information. > > To unsubscribe visit https://lists.isc.org/mailman/listinfo/kea-users. > [email protected] -- ISC funds the development of this software with paid support subscriptions. 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