From mboxrd@z Thu Jan  1 00:00:00 1970
From: Scott Taylor <scott@dctchambers.com>
Subject: Re: mac-ip pairs
Date: Thu, 19 Jun 2003 07:16:25 -0700
Sender: linux-admin-owner@vger.kernel.org
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At 06:54 06/19/03, you wrote:
>hello
>
>I have a small problem:
>
>a network (something about half of a C class IPs) and some users who I'd like
>to "stick" them to only one IP; half of the computers get their IPs via dhcp,

My DHCP server can set IP by MAC address.  Running patched DHCP2.0 on 
RedHat7.2.  Maybe your OS and distro are different.

This entry in my /etc/dhcpd.conf file, just before the subnet entry:

host jimmy.dct.net {
         option routers 192.168.1.200;
         option domain-name-servers 192.168.1.211;
         hardware ethernet 00:d0:b7:ad:17:37;
         fixed-address 192.168.1.85;
         }

HTH

Scott.