The purpose of this introductory article is to take a basic look at the journey of a packet across the Internet, from packet creation to switches, routers, NAT, and the packet's traverse across the Internet. This topic is recommended for those who are new to the networking and security field and may not have a basic understanding of the underlying process.
Check out this article:
http://www.securityfocus.com/infocus/1870Feel free to add your comments below.
Don