http://www.davidsudjiman.info/2006/03/27/installing-and-setting-tftpd-in-ubuntu/
http://www.cyberciti.biz/faq/install-configure-tftp-server-ubuntu-debian-howto/
https://tournasdimitrios1.wordpress.com/2011/02/22/setup-tftp-server-on-centos/
http://superuser.com/questions/581812/put-file-with-tftp-client-in-linux