|Red Hat Enterprise Linux 3: System Administration Guide|
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On the DHCP server, verify that the tftp-server package is installed with the command rpm -q tftp-server. If it is not installed, install it via Red Hat Network or the Red Hat Enterprise Linux CD-ROMs. For more information on installing RPM packages, refer to Part III Package Management.
tftp is an xinetd-based service; start it with the following commands:
/sbin/chkconfig --level 345 xinetd on /sbin/chkconfig --level 345 tftp on
This command configures the tftp and xinetd services to immediately turned on and also configures them to start at boot time in runlevels 3, 4, and 5.