type:
chkconfig --list |grep dhcpd
see if it is set on or off. If it is not listed type
rpm -qa |grep dhcp
If there is no listing, then dhcp is not installed. Fetch the RPM off the CD or download it from Redhat. If the chkconfig validates that dhcpd is installed and off, then type
chkconfig dhcpd on
Ok you now have a DHCP server. Now start digging out man pages on DHCP and look at matrix7's reference cause you have to modify your /etc/dhcpd.conf. You can have IP addresses assigned dynamically to the same machine via MAC address or just define a range of IP's to dole out or both.
Not all that tough. It's harder to get water out of a rock.
war...