Block IP adresses via DHCP ?

[bratac@t-onleine.com]

Hi folks,

i use dhcp3d to assign specific hosts in my network fixed ip adresses via MAC. Works fine ...
But is it possible to "block" an IP if someone tries to manualy set up an IP Adress on his host ?
Eg. dhcpd will assign 192.168.1.1 to the mac 00:11:22:33:44:55:66.
Someone other is trying to set up the ip 192.168.1.1 on his host and should get the message that the ip is allready in use ...

Any Ideas ?

Thanks
     Tobias