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Network security administrators cannot always accurately tell which end-to-end accesses are permitted within their network, and which ones are not. The problem is that every access is determined by the configurations of multiple, separately administered, components. As configurations evolve, a small change in one configuration file can have widespread(More)
One of the most significant unsolved problems for network managers and system administrators is how to repair a network infrastructure after discovering evidence of an extensive compromise. The technical issues are compounded by a breathtaking variety of human factors. We present a study of three significant compromises of a medium-scale network(More)
This paper describes an approach for managing package versions and updates in a homogenous manner across a heterogenous environment by intensively managing a set of software repositories rather than by managing the clients. This entails maintaining multiple local mirrors, each of which is aimed at a different class of client: One is directly synchronized(More)
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