Search for 'tainted' leases, symptom of duplicate IP

As an administrator I want to know if there are devices on my network using IP addresses that I am also trying to assign from my DHCP service.

One way of identifying these possible conflicts is by searching for OFFERS from Kea that are REFUSED by the client. This is not the same thing as 'ping check' because the check is performed by the client rather than the server, but the information is useful to the server administrator for the same reason - it indicates that and IP you are trying to assign is already in use and that situation should be investigated.