//Cyber Battlefield/Networking – Basics

We've surveyed the workings of a single computer system — the physical machine, OS and programs. We've also looked at how the World Wide Web, a system that's comprised of millions of web servers and billions of browsers communicating with one another. The web is just one example of a system built on top of computer networks — the Internet, in particular. We will now turn our attention to how the Internet works and, later, to how wired and wireless networks work in general. This class will be our first step.

The Internet in 60 Seconds: Hosts, IP Addresses and Packets

IP Addresses

IPv4 and IPv6

   Why only 32 bits ?

At this 2008 conference sponsored by Google, Vinton Cerf tells us why. Listen to the discussion at 13:00 - 14:35. Vinton Cerf, Project Director for the TCP/IP research program at DARPA in 1976, is at the podium. Bob Hinden, who is seated, helped develop the first Internet routers. [Embedded by permission of the YouTube Terms of Service]

North America Out of IPv4 Addresses

The limited availability of IPv4 addresses has been coming for a while (years in fact). ... Well the day has finally come for North America. ARIN (American Registry for Internet Numbers) recently reported (retrieved 28 Sep 2015) that they do not have any more IPv4 addresses. ArsTechnica also discusses the status of transitioning from IPv4 to IPv6.

Domain Names

DNS: The Phonebook of the Internet


"Nippernet" is the colloquial name for the DoD subset of the Internet that carries "sensitive but UNCLASSIFIED IP data". Access to the NIPRNet is tightly controlled: all data crossing the NIPRNet/Internet boundary must pass through a DoD-owned router, and hosts on the NIPRNet resolve names using DNS servers operated by the DoD Network Information Center. (The DoD also owns and operates the SIPRNet, for CLASSIFIED data.)

Following a packet's path