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Date: Mon, 27 Oct 2008 17:34:34 +0100 (CET)
From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
To: Odhiambo Washington <odhiambo@gmail.com>
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Cc: User Questions <freebsd-questions@freebsd.org>
Subject: Re: DHCP and MAC addresses
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> Hello List,
>
> Suppose I have 100 Desktops, and I want my DHCP server to _only_
> assign IP addresses to these hosts, using MAC addresses, is there a
> way to tell the DHCP server to NOT assign any IP address to a machine
> whose MAC address it doesn't know?

of course.

and you can assign IP to each MAC

first

deny unknown-clients;
(dont specify range at all)

then

  host something {
   hardware ethernet 00:11:22:33:44:55;
   fixed-address 1.2.3.4;
   option host-name "something.somewhere";
   option routers router_IP;
  }