How to configure TFTP server in Redhat Linux?

This would need a separate package/RPM and then following two steps:

# rpm -qa | grep -i tftp
tftp-server-0.49-2
tftp-0.49-2

Remember, the version of TFTP dont really matter so dont focus on version as long as it is coming from same RHEL media which was used to install OS. :)

Once RPM is installed, then make sure the /etc/xinetd.d/tftp file reads as below (special foucs on "disable=no")

# cat /etc/xinetd.d/tftp
# default: off
# description: The tftp server serves files using the trivial file transfer \
#       protocol.  The tftp protocol is often used to boot diskless \
#       workstations, download configuration files to network-aware printers, \
#       and to start the installation process for some operating systems.
service tftp
{
        disable = no
        socket_type             = dgram
        protocol                = udp
        wait                    = yes
        user                    = root
        server                  = /usr/sbin/in.tftpd
        server_args             = -s /tftpboot
        per_source              = 11
        cps                     = 100 2
        flags                   = IPv4
}

By default, TFTP server provides files from /tftpboot directory unless it is changed in /etc/xinetd.d/tftp configuration file.

Once above is all set, then restart xinetd service and it should be all set!

# chkconfig  --list | grep -i tftp
        tftp:           on

# service xinetd status
xinetd (pid  2374) is running...

As long as above is working + FIREWALL is open, then TFTP server should work fine.

On another note, if needed, open port 69 in firewall which is a TFTP server port.

Special note: In case of RHEL 6.0, it was not working for me but when I upgraded OS to RHEL 6U1, it again started working for me. So, I believe that RHEL 6U0's TFTP RPM has some bug. If you come across any workaround, please do let me know as well. :)

Enjoy! :)