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JAMES M. KRETCHMAR has worked for six years as a systems programmer and network engineer for MIT Network Operations, helping to run MIT's campus-wide, 30,000-host network. He has administered all levels of the network hierarchy; written and deployed tools to streamline administration; implemented campus-wide routing plans; and been extensively involved in design, deployment, and troubleshooting of core network infrastructure. MIT makes extensive use of open source tools-several of which Kretchmar personally wrote.