[Kea-users] Grouping host entries

[Darren Ankney]

Hi Christoph,

Assuming each client had a "host" entry in ISC DHCP, you could
leverage this to add clients to a different class based on which
eventual file you want to send.  For example:

"reservations": [
        {
            "hw-address": "aa:bb:cc:dd:ee:ff",
            "client-classes": [ "bookworm"]
        }
],
"client-classes": [
  {
    "name": "bookworm"
  },
  {
    "name": "pxe-system-type-00:00",
    "test": "(option[123].hex == '00:00') and (member('bookworm'))",
    "boot-file-name": "/linf/bookworm/boot/current-amd64/pxelinux.0"
  }
]

Please review this documentation for further details:
- https://kea.readthedocs.io/en/latest/arm/classify.html
- https://kea.readthedocs.io/en/latest/arm/dhcp4-srv.html#host-reservations-in-dhcpv4

Thank you,
Darren Ankney

On Fri, May 30, 2025 at 9:15 AM Christoph Pleger
<Christoph.Pleger at cs.tu-dortmund.de> wrote:
>
> Hello,
>
> > In Kea, you could use class membership as a proxy for groups.  For
> > example, this:
> >
> > Would be setup in Kea as four classes with different test lines for
> > the pxe-system-type and value.  For example something like:
> >
> > "client-classes": [
> >   {
> >     "name": "pxe-system-type-00:00",
> >     "test": "option[123].hex == '00:00'",
> >     "boot-file-name": "/linf/bookworm/boot/current-amd64/pxelinux.0"
> >   }
> > ]
>
>
> That does it for the last component of boot-file-name, syslinux.efi or
> pxelinux.0, but how about the second component, bullseye or bookworm in
> my example, which does not depend on anything the client sends in its
> dhcp request, but only on which OS version I want to run on the DHCP
> Client?
>
> Regards
>   Christoph
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