On the DHCP server, verify that the tftp-server package is installed with the command rpm -q tftp-server.

tftp is an xinetd-based service; start it with the following commands:

/sbin/chkconfig --level 345 xinetd on
/sbin/chkconfig --level 345 tftp on

These commands configure the tftp and xinetd services to immediately turn on and also configure them to start at boot time in runlevels 3, 4, and 5.