Hi Dipesh, This is not currently supported. You can open an issue here: https://gitlab.isc.org/isc-projects/kea/-/issues/ requesting the support be added.
Thank you, Darren Ankney On Fri, Jun 13, 2025 at 2:13 AM Dipesh Kayastha < er.dipesh.kayas...@gmail.com> wrote: > Dear Kea Development Team, > > I am currently working on migrating configurations from ISC DHCP (dhcpd) > to Kea DHCP and encountered a limitation regarding the next-server field. > > In ISC DHCP, it is valid to specify either an IP address or a fully > qualified domain name (FQDN) for the next-server directive, as referenced > in the dhcpd.conf man page: > https://linux.die.net/man/5/dhcpd.conf > > However, in Kea, the next-server field under subnet4 appears to accept > only IPv4 addresses. If an FQDN is used (e.g., "next-server": " > pxe.boot.example.com"), the configuration fails to parse and returns an > error like: > > > *2025-06-12 13:35:40.228 ERROR [kea-dhcp4.dhcp4/1.140187402663808] > DHCP4_CONFIG_LOAD_FAIL configuration error using **file: > /etc/config/kea4.conf**, reason: subnet configuration failed: invalid > parameter next-server : *pxe.boot.example.com*(/etc/config/kea4.conf:169:24) > * > > This becomes a compatibility issue during migration, especially in > environments that rely on DNS to resolve boot server IPs dynamically. > > However, ISC DHCP (dhcpd) supports both IP addresses and FQDNs in the > next-server field, as documented here: > > https://linux.die.net/man/5/dhcpd.conf > [image: image.png] > > > Is there any plan to support FQDNs in Kea for the next-server field, > similar to how ISC DHCP handles it? FQDN support can be useful in dynamic > environments where the boot server’s IP address may change and is managed > via DNS. > > I'm looking forward to hearing back from you > > > Regards, > .Dipesh > > -- > 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. > > Kea-users mailing list > Kea-users@lists.isc.org > https://lists.isc.org/mailman/listinfo/kea-users >
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