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No subnamespaces.
http://www.uic.edu/depts/accc/classes/gnu-linux-101/
Sysadmincasts Video Series
The Linux Filesystem Structure
The Sudoers File
Bash Scripting Tutorial
http://www.catonmat.net/blog/top-ten-one-liners-from-commandlinefu-explained
bash-redirections-cheat-sheet.pdf
Stream Editor (SED) Tutorial
IPv4 Netmask Explanation
NAT Tutorial
Dynamic NATing
Advanced Routing How To
http://www.cyberciti.biz/tips/linux-iptables-examples.html
IPTables Rules Reference
http://www.christowles.com/2010/11/enable-ldap-over-ssl-ldaps-on-windows.html
MAC-VLAN Virtual Interfaces
Some notes ISC DHCPD failover setups
Active Directory TCP/UDP Port List
https://library.netapp.com/ecm/ecm_download_file/ECMP1117863
Static DHCP inside libvirt