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To: Colin Watson <sb.mailinglist@lambdabroadband.com>,
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From: Lowell Gilbert <freebsd-questions-local@be-well.no-ip.com>
Date: 07 Sep 2003 18:24:52 -0400
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Subject: Re: Binding MAC to IP Statically
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Chuck Swiger <cswiger@mac.com> writes:

> Colin Watson wrote:
> [ ...rewrapped to 80-columns... ]
> > Any way to bind a MAC address statically to an IP?. I wish to do this to
> > prevent a user from changing his IP address on the subnet, so if he does he
> > can't pass traffic. I have experimented with ipfw, but I can't quite see how
> > I could accomplish the binding of a IP statically to a nic's MAC. Any ideas
> > be appericated.
> 
> IPFW2 lets you perform firewall actions on a MAC address, rather than an IP.
> 
> You can configure a DHCP server to staticly allocate an IP address to
> that machine via something like this in {/usr/local}/etc/dhcpd.conf:
> 
> host pi.codefab.com {
>          hardware ethernet 00:00:00:00:00:00;
>          fixed-address 66.234.138.67;
> }

To be complete:
The arp(8) command does literally what was asked for.