[Kea-users] legal-log

[Darren Ankney]

Hi Anders,

This is most likely because the client is renewing directly to the
DHCP server.  You can force Kea to retain the relay-agent information
option data using '"stash-agent-options": true' (see here:
https://kea.readthedocs.io/en/kea-3.2.0/arm/dhcp4-srv.html#stash-agent-options).
This should make the cid and rid available during the REQUEST.  Note
that '"store-extended-info": true,' is required to make the former
work (see: https://kea.readthedocs.io/en/kea-3.2.0/arm/dhcp4-srv.html#storing-extended-lease-information).

Thank you,
Darren Ankney

On Wed, Jul 8, 2026 at 3:47 PM Anders Rosendal <anders at rosendal.nu> wrote:
>
> Hi
> I'm on my way of migrating from isc-dhcp to isc-kea for a village network with 400 ftth-consumers, and is now looking at the logging to track which customer gets which IP.
> I have enabled the libdhcp_legal_log-hook with the most basic configuration:
>
> {
>                 "library": "/usr/lib/x86_64-linux-gnu/kea/hooks/libdhcp_legal_log.so",
>                 "parameters": {
>                     "base-name": "kea-legal4",
>                  }
> }
>
> The problem I have is that only on the initial DISCOVER/REQUEST the server logs the cid and rid, on subsequent renews it only logs IP, mac and extended time.
>
> How do I get it to log all parameters on all request/ack events?
>
> 2026-07-07 16:11:04 CEST Address: 213.21.95.157 has been assigned for 2 hrs 0 mins 0 secs to a device with hardware address: hwtype=1 00:0a:59:02:0c:39 connected via relay at address: 213.21.95.129, identified by circuit-id: 65:74:68:20:30:2f:30:2f:33:36:3a:31:30:31:2e:30:20:61:73:31:30:30:2e:6d:6a:6f:6c:65:2e:63:6f:6d:2f:30:2f:30:2f:30:2f:30:2f:30 (eth 0/0/36:101.0 as100.mjole.com/0/0/0/0/0) and remote-id: 61:73:31:30:30:2e:6d:6a:6f:6c:65:2e:63:6f:6d (as100.mjole.com)
> 2026-07-07 17:11:03 CEST Address: 213.21.95.157 has been assigned for 2 hrs 0 mins 0 secs to a device with hardware address: hwtype=1 00:0a:59:02:0c:39
> 2026-07-07 18:11:03 CEST Address: 213.21.95.157 has been assigned for 2 hrs 0 mins 0 secs to a device with hardware address: hwtype=1 00:0a:59:02:0c:39
>
> /Anders R
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