dhcpd MAC filter

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I can't determine if you want to simply assign addresses by MAC address
or set up a firewall to packet filter based upon MAC address.  dhdpd can
do the former and ipfw can do the latter.  The man pages dhcpd and ipfw
have examples on how to accomplish either or both.  

>Is there a way to allow or disallow certain computers by their
>MAC number?
>I prefer that my FreeBSD system hand out the IP addresses,
>and I cannot find this MAC-filtering ability at man dhcpd.

J