[Kea-users] legal-log

[Anders Rosendal]

Hi
Thanks, with those two options it indeed started logging on all entries.
Still finds it a bit strange that it does not do this automatically. I have
double checked with tcpdump and all requests includes option82 information,
regardless if the request is broadcast (via relay) or unicast directly to
the server.

/Anders

On Wed, 8 Jul 2026 at 22:11, Darren Ankney <darren.ankney at gmail.com> wrote:

> 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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