Hi,
You could create a reservation for each client and set the
"boot-file-name" to the desired parameter. This reservation need not
contain anything but the mac address and the boot-file-name parameter.
These can be added with the API. If this is not attractive, I suggest
that you create an account in Gitlab and open a new issue here:
https://gitlab.isc.org/isc-projects/kea/-/issues as I did not see any
preexisting issue there requesting this feature.
Thank you,
Darren Ankney
On Mon, Oct 27, 2025 at 7:02 AM Marcin Jurczuk wrote:
>
> Hi Guys,
>
> I'm fighting for past few days with kea setup for migration from ISC-DHCP.
> I can't make file option in DHCP packet set to dynamic value:
> My device expects next-server and filename value provided by dhcp and
> filename config path must be autogenerated and based on device MAC
> I was able to set up option 67 with this:
> {
> "library": "/usr/lib/kea/hooks/libdhcp_flex_option.so",
> "parameters": {
> "options": [
> {
> "add": "concat(hexstring(pkt4.mac,''), '.cfg')",
> "client-class": "STB",
> "code": 67
> }
> ]
> }
> }
>
> This works as expected in terms option generation but device don't want
> option 67 - it wants boot-file in DHCP (bootp) packet
>
> That seems very populat stuff in DOCSIS/PON world where boot-file is either
> MAC/Serial/other dynamic string so there must be easy way to set this up :)
>
> However all my attempts to make it for filename field failed.
> Any idea how to achieve this without writing own hook ?
>
> Thanks in advance.
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