Deny DHCP IP to a certain MAC?

[Phil]

Actually the easiest way is this:

add this to the subnet declaration:

...
subnet 10.64.87.0 netmask 255.255.255.0 {
        if option host-name="" {deny unknown-clients;}
...

This works, I tried it with a known hostname and it was denied. Then I
tried it on one of the pc with blank hostname and it worked their too.

Phil