On 17/12/2019 23:39, Eduardo Lúcio Amorim Costa wrote:
I reserved an IP ("reservations") for a MAC ("hw-address"). That MAC was removed from my subnet and the IP was reserved for another MAC. That another MAC cannot "get" the IP that is now reserved for it and ends up using an IP from "pool".

What I can do to make the new machine (MAC) use this IP?

I suspect there is still a valid lease for the old MAC address with that IP address.  Kea doesn't rip it away: the new host will get an IP from pool until the old lease has expired.  For a full description of this scenario see:

https://kea.readthedocs.io/en/v1_6_0/arm/dhcp4-srv.html#conflicts-in-dhcpv4-reservations


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