DHCP & known MAC addresses

[Ryan Golhar]

Is there a way I can assign DHCP managed IP addresses to only computers
with known MAC addresses?  

Currently, I'm giving out IP addresses to any DHCP request using:

        subnet 123.456.789.0 netmask 255.255.255.0 {
                range 123.456.789.240 123.456.789.245;
        }

I only want to give out IP addresses to known computers without
assigning specific IP addresses to specific MAC addresses.   Our pool of
known computers is bigger than our pool of IP addresses, but all the
computers will never be present at the same time.

Can I just add lines of "fixed-address" to this?

Ryan