This issue has been recurring for the past 7 to 8 years. I need a solution,
Network with configured with no area for static ip addresses. NW 6.5. DNS
and DHCP being used.

I have tried several things.

DHCP -- set the address "manual", saved then set it to "exclusion",
DNS -- created an entry for the machine name and the IP address
Set both to the NDS object.

After a period of time, the IP address reverts to Dynamic.

Any help would be appreciated.

Liz M