[Kea-users] dhcp4 conflict reservation addres - please help

Marcin Romanowski marcin at nicram.net
Thu Jun 25 13:23:42 UTC 2020


I have problem with changing mac for user.
User had set one mac, got ip and lease for 86400 has been created. Now I
changed client's mac address and dhcp don't assign address.
I was making release but also didn't work. Client is reserved in
reservation block

20.06.25 15:06:46.476 WARN  [kea-dhcp4.alloc-engine/24787]
ALLOC_ENGINE_V4_DISCOVER_ADDRESS_CONFLICT [hwtype=1 aa:aa:aa:aa:aa:aa],
cid=[ff:00:00:00:01:00:03:00:aa:aa:aa:aa:aa:aa], tid=0x5874a390:
conflicting reservation for address with existing lease

  "Dhcp4": {
    "authoritative": true,
    "boot-file-name": "",
    "calculate-tee-times": false,
    "control-socket": {
      "socket-name": "/opt/kea/var/run/kea/kea-dhcp4-ctrl.sock",
      "socket-type": "unix"
    "decline-probation-period": 86400,
    "expired-leases-processing": {
      "flush-reclaimed-timer-wait-time": 25,
      "hold-reclaimed-time": 3600,
      "max-reclaim-leases": 100,
      "max-reclaim-time": 250,
      "reclaim-timer-wait-time": 10,
      "unwarned-reclaim-cycles": 5

which option I should set to work this properly and if I change client's
mac address?

Best Regards

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