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We're using the legal log hook:</div>
<div style="line-height: 19px; font-family: "Segoe UI", "Segoe UI Web (West European)", "Helvetica Neue", sans-serif; font-size: 13pt; color: rgb(23, 78, 134);" class="elementToProof">
"hooks-libraries": [</div>
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{</div>
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"library": "/usr/lib/x86_64-linux-gnu/kea/hooks/libdhcp_legal_log.so"</div>
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},</div>
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]</div>
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<br>
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Then, in /var/log/kea/kea-legal.<YYYYMMDD>.log, we see the circuit/remote id info:<br>
<br>
2025-10-30 23:59:49 UTC Address: REDACTED has been assigned for 1 days 0 hrs 0 mins 0 secs to a device with hardware address: hwtype=1 REDACTED connected via relay at address: REDACTED, identified by circuit-id: REDACTED (REDACTED) and remote-id: REDACTED (REDACTED),
context: { "ISC": { "client-classes": [ REDACTED ] } }</div>
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<br>
<br>
We gave the IPv6 side a different name (or maybe the docs say to do this, idr):<br>
"hooks-libraries": [</div>
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{</div>
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"library": "/usr/lib/x86_64-linux-gnu/kea/hooks/libdhcp_legal_log.so",</div>
<div style="font-family: "Segoe UI", "Segoe UI Web (West European)", "Helvetica Neue", sans-serif; font-size: 13pt; color: rgb(23, 78, 134);" class="elementToProof">
"parameters": {</div>
<div style="font-family: "Segoe UI", "Segoe UI Web (West European)", "Helvetica Neue", sans-serif; font-size: 13pt; color: rgb(23, 78, 134);" class="elementToProof">
"base-name": "kea-forensic6"</div>
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}</div>
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},</div>
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]</div>
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<br>
</div>
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<br>
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<div style="font-family: "Segoe UI", "Segoe UI Web (West European)", "Helvetica Neue", sans-serif; font-size: 13pt; color: rgb(23, 78, 134);" class="elementToProof">
Thanks,</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Kea-users <kea-users-bounces@lists.isc.org> on behalf of Tim Nowaczyk <tnowaczyk@hostedbackbone.net><br>
<b>Sent:</b> Wednesday, November 19, 2025 10:56 AM<br>
<b>To:</b> Kea user's list <kea-users@lists.isc.org><br>
<b>Subject:</b> [Kea-users] Logging Option 82 Circuit-id and Remote-id.</font>
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Hello,</div>
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I have a requirement where Ineed to log the details from the DHCP Option-82 field whenever a lease is allocated so that we can go back and see which customer was using a particular IP at a given time. The current output of the DHCP4_LEASE_ALLOC message just
contains a mapping between MAC address and IP address. Is there a different logging logger name we should be logging that would contain these details? Does anyone have any suggestions on how we can accomplish this?</div>
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<br>
2025-11-19 15:44:13.438 INFO [kea-dhcp4.leases/160072.131853078283968] DHCP4_LEASE_ALLOC [hwtype=1 00:11:22:33:44:55], cid=[no info], tid=0xdb58de5a: lease 198.51.100.2 has been allocated for 300 seconds</div>
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We are running Kea 3.0.2</div>
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Thanks,</div>
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Tim Nowaczyk</div>
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