http://www.sqa.org.uk/e-learning/NetInf101CD/page_61.htm

http://doc.pfsense.org/index.php/OpenVPN_Site-to-Site_PKI_(SSL)

http://techgurulive.com/how-to-test-udp-connectivity/
http://www.networkuptime.com/nmap/page3-10.shtml

nota: como podemos ver no último link se uma porta udp for considerada aberta isto pode significar que esta não está aberta (por detrás de uma firewall)

http://doc.pfsense.org/index.php/Multi-WAN_using_VLANs_with_pfSense

SELECT SUM(filesize) FROM files WHERE uid = 6

http://drupal.org/node/1233316

http://www.ehow.com/how_4736145_edit-locked-word-document.html

hash -r

http://unix.stackexchange.com/questions/5609/how-do-i-clear-bashs-cache…

http://gallery.technet.microsoft.com/scriptcenter/d0670079-6158-4dc5-a9…

no windows passtos num funciona! hahahaha!

http://redmine.pfsense.org/issues/1266

http://linux.101hacks.com/unix/umount/