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dhcpd.conf prevent ip addresses from being rotated (not static)

in windows dhcp server if i set hte lease time to unlimited or any duration the ip address per mac is always the same .. (dhcp static) i guess

How do i do that in linux? its really anonying if someone reboots an android devices reconencts and ihave to find the ip address when there are 100s of devices.

Thank you .>>

max-lease-time 315532800;
default-lease-time 315532800;

DHCP Server Configuration file.

see /usr/share/doc/dhcp*/dhcpd.conf.sample