how to assign a different IP address each lease renew?

Hi

There´s any way to setup dhcpserver to assign a different ip address each time the client renew the lease? i would like to know too if theres possible using pppoe server

for exemple now the dhcp gave to the user 192.168.0.2 next time it gives 192.168.0.90

some adsl providers do something like that using pppoe, each time the client connect it gets another ip..

thanks

Gustavo

You may descrease lease-time parametr, then you will increase the possibility that lease will be expired and someone will take it, when client will connect to the network again.