[Kea-users] Possible bug with Kea DHCP Server?

[Veronique Lefebure]

Hi Chib,
Have you checked if the client is requesting the IP with the same ClientID as the one it was using when it first got the lease ?
Cheers,v.
________________________________
From: Kea-users <kea-users-bounces at lists.isc.org> on behalf of Stephen Dennis (Gmail) <skeetabomb at gmail.com>
Sent: Monday, September 11, 2023 3:43 AM
To: kea-users at lists.isc.org <kea-users at lists.isc.org>
Subject: [Kea-users] Possible bug with Kea DHCP Server?

Hi,

After a client received a lease, the client was rebooting.
It tried to ask for the same IP (Windows machine), but Kea refused with this error, despite the fact that Kea has a reservation for that client's MAC:
"2023-09-10 22:38:00.308 WARN  [kea-dhcp4.alloc-engine/2752.140528795599552] ALLOC_ENGINE_V4_DISCOVER_ADDRESS_CONFLICT [hwtype=1 xx:xx:xx:xx:xx:xx], cid=[01:xx:xx:xx:xx:xx:xx], tid=0xb4da0bab: conflicting reservation for address 192.168.1.11 with existing lease Address:       192.168.1.11"

1. Why would Kea not just answer the client with the same IP already assigned to that client?
2. Is there no mechanism in place to deal with the case where a client reboots and has to resend a DHCPREQUEST during an existing lease for that client?

This, to me, looks like a bug.

Thanks,
Chib

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