|From The Editor
Numerous technologies have been developed to protect or isolate corporate networks from the Internet at large. These solutions incorporate security, either end-to-end (IP security, or IPSec), or at the Internet/intranet border (firewalls). A third class of systems allows a range of IP addresses to be used internally in a corporate network, while preserving IP address consumption through the use of a single public address. This latter class of device is called a Network Address Translator (NAT), and while many Internet engineers consider NATs to be ?evil,? they are nonetheless very popular. Combining IPSec, NATs, and firewalls can be quite challenging, however. In our first article Lisa Phifer explains the problem and offers some solutions.
Successful network design is the result of many factors. In addition to the basic building blocks of routers, switches and circuits, network planners must carefully consider how these elements are interconnected to form an overall system with as few single points of failure as possible. In our second article, Valdis Krebs looks at how lessons learned from social network analysis can be applied to the design of computer networks.
The current Internet grew out of several government-funded research efforts that began in the late 1960s. Today, basic technology development as well as research into new uses of computer networks continues in many research ?testbeds? all over the world. Bob Aiken describes the past, present and future state of network research and research networks.
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