Recently as well as in the not so recent past I have noticed that certain devices like the IP phones complain or stop working when a duplicate IP is detected. This also seems to happen ever so often with game consoles (since they are connected to the network too).

Aside from this being quite annoying I was wondering how I can solve this issue once and for all.

Would changing the settings in DNS so dynamic updates are changed from just secure to both secure and non-secure do anything to help this matter or am I looking at the wrong thing.

I have tried removing IP addresses from DHCP in the hopes of resolving the conflicts, but still some seem to stick around and cause certain devices to not work until I can find the old device that was using the IP or simply set the non-functioning device to a static IP.

Perhaps the solution is right under my nose, but I am not sure what I need to change in order to get this problem out of my way permanently.

As always thanks for any light you can shed on my problem.