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Testing for Traffic Differentiation with ChkDiff: The Downstream Case

机译：使用ChkDiff测试流量差异：下游案例

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In the past decade it has been found that some Internet operators offer degraded service to selected user traffic by applying various differentiation techniques. If from a legal point of view many countries have discussed and approved laws in favor of Internet neutrality, confirmation with measuring tools for even an experienced user remains hard in practice. In this paper we extend and complete our tool ChkDiff, previously presented for the upstream case, by checking for shaping also on the user's downstream traffic. After attempting to localize shapers at the access ISP on upstream traffic, we replay downstream traffic from a measurement server and analyze per-flow one-way delays and losses, while taking into account the possibility of multiple paths between the two endpoints. As opposed to other proposals in the literature, our methodology does not depend on any specific Internet application a user might want to test and it is robust to evolving differentiation techniques that alter delays or induce losses. We provide here a detailed description of the downstream tool and a validation in the wild for wired, WiFi and 3G connections.
机译：在过去的十年中，已经发现一些互联网运营商通过应用各种区分技术为选定的用户流量提供降级的服务。如果从法律的角度来看，许多国家已经讨论并批准了支持互联网中立性的法律，那么即使是经验丰富的用户也很难使用测量工具进行确认。在本文中，我们通过检查用户下游流量的整形情况，扩展并完善了先前针对上游情况介绍的工具ChkDiff。尝试在上游流量上在访问ISP处定位整形器之后，我们重播了来自测量服务器的下游流量，并分析了每个流的单向延迟和损失，同时考虑了两个端点之间存在多条路径的可能性。与文献中的其他建议相反，我们的方法不依赖于用户可能要测试的任何特定Internet应用程序，并且对于不断发展的差异化技术（改变延迟或引起损失）的发展是可靠的。我们在此提供了下游工具的详细说明，并提供了针对有线，WiFi和3G连接的野外验证。

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