There are many options for setting up a TFTP server. It can be Linux, Windows, or even ran right off of the vCenter Server Appliance (VCSA). Here are the steps I used to setup TFTP on CentOS:

1. yum update

   1	yum update

2. yum install emacs tftp-server -y

   1	yum install emacs tftp-server -y

3. chkconfig --level 345 tftp on

   1	chkconfig --level 345 tftp on

4. chkconfig --level 345 xinetd on

   1	chkconfig --level 345 xinetd on

5. chmod 777 /var/lib/tftpboot/

   1	chmod 777 /var/lib/tftpboot/

6. emacs /etc/xinetd.d/tftp

   1	emacs /etc/xinetd.d/tftp

   • Add the -c to this line:
     
     server_args = -c -s /var/lib/tftpboot

     1	server_args = -c -s /var/lib/tftpboot

7. service xinetd start

   1	service xinetd start

8. Check to see if the service is up:
   • netstat -ntulp

     1	netstat -ntulp

   • Make sure you see the :69 to verify that it is running?
9. Modify iptables to allow udp traffic or turn it off
   • Edit: /etc/sysconfig/iptables
     
     -A INPUT -m state --state NEW -m udp -p udp --dport 69 -j ACCEPT

     1	-A INPUT -m state --state NEW -m udp -p udp --dport 69 -j ACCEPT

   • Or turn iptables off completely (not the most secure option)
     
     service iptables stop

     1	service iptables stop