Training & How-to's

 

Learn to Subnet
http://www.learntosubnet.com
A Free Lecture-based Educational Course that covers Binary Math, IP Addressing, Default Subnet Masks, ARP, and more.
How to upgrade ESXi 4.1 to ESXi 5.0 
NOTE: Ensure you stop all VMs and have extra disk space in your datastore prior to the upgrade
http://blog.vmpros.nl/2011/07/13/vmware-easy-upgrade-esxi-4-1-to-esxi-5-0/
A tcpdump Tutorial and Primer
http://danielmiessler.com/study/tcpdump/
Introduction to ARP Poisoning
http://www.oxid.it/downloads/apr-intro.swf
UFW - Uncomplicated Firewall
https://www.ubuntu.com/community/UFW"
VMWare - ESXi - Configuring the speed and duplex of a host network card
http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1004089"