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首页> 外文会议>2015 IEEE Conference on Communications and Network Security >mTor: A multipath Tor routing beyond bandwidth throttling
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mTor: A multipath Tor routing beyond bandwidth throttling

机译：mTor：超出带宽限制的多路径Tor路由

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One of the main obstacles that impede further expansion of Tor, the most popular anonymous communication system, is its large performance variance. The problem becomes worse when bandwidth-intensive applications, such as video streaming, contend with latency-sensitive applications, such as web browsing, for the scarce resources. Most of the existing solutions involve circuit-scheduling techniques to prioritize interactive traffic over bulk traffic or to completely throttle traffic of bandwidth-intensive applications. However, these approaches not only rely on accurate detection of traffic types but also adopt detection strategies that are easy to game. In this paper, we propose a different approach by exploring new capabilities of Tor to support bulk data transfers without degrading the performance of interactive traffic. Based on our observations that a large portion of low-bandwidth relays are under-utilized, we develop a multi-path Tor (mTor) routing algorithm to cater to bandwidth-intensive applications by constructing multiple circuits across low-bandwidth Tor relays. We present a self-adaptive ???pulling??? scheduling technique to dynamically allocate cells across multiple circuits, and an active congestion detection scheme to prevent slow circuits from becoming a bottleneck of the entire tunnel. Based on the results from experiments on the live Tor network and simulations over the Shadow simulator [1], we conclude that mTor not only achieves a desirable performance for bandwidth-intensive applications by utilizing multiple low-bandwidth relays, but also benefits latency-sensitive applications by reducing the load on high-bandwidth relays.
机译：阻碍Tor（最流行的匿名通信系统）进一步扩展的主要障碍之一是其巨大的性能差异。当带宽密集型应用程序（例如视频流）与对延迟敏感的应用程序（例如Web浏览）争夺稀缺资源时，问题变得更加严重。现有的大多数解决方案都涉及电路调度技术，以使交互通信优先于批量通信或完全限制带宽密集型应用程序的通信。但是，这些方法不仅依赖于对流量类型的准确检测，而且还采用易于操作的检测策略。在本文中，我们通过探索Tor的新功能以支持批量数据传输而不降低交互式流量的性能，提出了一种不同的方法。基于我们的观察结果，即大部分低带宽中继未得到充分利用，我们开发了一种多路径Tor（mTor）路由算法，通过在低带宽Tor中继上构建多个电路来满足带宽密集型应用。我们提出一种自适应的“拉动”调度技术可在多个电路之间动态分配信元，以及一种主动的拥塞检测方案，可防止速度较慢的电路成为整个隧道的瓶颈。根据实时Tor网络上的实验结果和Shadow模拟器上的仿真结果[1]，我们得出结论，mTor不仅通过利用多个低带宽中继器为带宽密集型应用实现了理想的性能，而且对延迟敏感通过减少高带宽继电器的负载来实现应用。

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