If there is a router involved it should have an option to set how long it leases an IP address for.
thanks, i didn't notice the static DHCP setion in my router. and thanks for the other ideas, guys.Alternatively most routers give you the ability to program DHCP reservations. This would be based on the MAC address of each device. If you were to give a PC a static IP assigned through Windows, if you format it's gone. If you format and the NIC is the same, still there
Also, please don't bump your own thread.
and sorry for bumping. was i suppose to make a new thread with the same question?