I would like that my Dhcp server renew lease using different IP

[Sébastien CRAMATTE]

Hello,

I've got /22 subnet  (1024Ip's)  ...
What happens is that my customers always keep the same IP like if paid
for a static one ...
More over some clients change their windows property and force the IP as
static ...

I would like that my Dhcp server renew lease using different IP  and
prevent duplicates ... not every day  but at least every week or month ...

Does it exits a mean ?

Regards