A Measurement Study of Changes in Service-Level Reachability in the Global TCP/IP Internet

科罗拉多州的网络资源发现项目调查了一些问题，这些问题涉及允许Internet用户在大型管理分散的环境中发现感兴趣的资源，包括文档、网络服务和人员等资源。这些项目中隐含的假设是，互联网将继续增长和发展，成为支持广域分布式应用程序的媒介。为了应对一些广为人知的问题，许多网站都安装了限制其受到安全入侵的机制。虽然这些措施比安全违规可能造成的损害更可取，但如果采取极端措施，它们可能会限制互联网的能力。为了了解这种情况的演变，研究人员建议对全球TCP/IP互联网中服务级别可达性的变化进行纵向测量研究。他们收集的数据将揭示网站如何在确保合理安全的同时支持开放网络使用的问题的变化。

The Networked Resource Discovery Project of Colorado has investigated a number of issues concerned with allowing users of the Internet to discover resources of interest in large administratively decentralized environments, including resources such as documents, network services, and people. Implicit in these projects is the assumption that the Internet will continue to grow and evolve as a medium for supporting wide area distributed applications. In response to a number of well publicized problems many sites have installed mechanisms to limit their exposure to security intrusions. While these measures are preferable to the damage that could occur from security violations, taken to extremes they could limit the capability of the Internet. To understand the evolution of this situation, the researchers propose to carry out a longitudinal measurement study of changes in service-level reachability in the global TCP/IP Internet. The data they gather will uncover changes in how sites resolve the problem of supporting open network usage while ensuring reasonable security.