Reference of Networking

http://en.wikipedia.org/wiki/IPv6 --> IPv6

http://en.wikipedia.org/wiki/IPv4 --> IPv4

http://en.wikipedia.org/wiki/Network_address_translation --> Network Address Translation

http://darojatun.blogsome.com/2008/06/29/
nat-internet-sharing-di-linux-dengan-iptables-dalam-4-langkah/

http://en.wikipedia.org/wiki/Virtual_private_network

http://id.wikipedia.org/wiki/Routing