On the Accuracy of Tor Bandwidth Estimation
On the Accuracy of Tor Bandwidth Estimation
复制标题
论Tor带宽估计的准确性
DOI：
10.1007/978-3-030-72582-2_28
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Johnson, Aaron
中科院分区：
文献类型：
--
作者：
Jansen, Rob;Johnson, Aaron
ToR网络使用客户端流量速度的中继自我测量来估计其中继的带宽。这些估计在很大程度上决定了现有流量负载如何在中继站之间平衡，并用于评估网络处理未来流量负载增加的能力。因此，它们的准确性对于优化Tor的业绩和制定增长战略非常重要。然而，它们的准确性从未被测量过。我们通过对公共网络数据的分析和在整个实时网络上运行的活跃实验来研究ToR容量估计的准确性。我们的结果表明，带宽估计低估了总网络容量至少50%，并且对于高带宽和低正常运行时间的中继，误差更大。我们的工作表明，改进Tor的带宽测量系统可以提高网络性能，并更好地为应对未来增长提供计划。
The Tor network estimates its relays’ bandwidths using relay self-measurements of client traffic speeds. These estimates largely determine how existing traffic load is balanced across relays, and they are used to evaluate the network’s capacity to handle future traffic load increases. Thus, their accuracy is important to optimize Tor’s performance and strategize for growth. However, their accuracy has never been measured. We investigate the accuracy of Tor’s capacity estimation with an analysis of public network data and an active experiment run over the entire live network. Our results suggest that the bandwidth estimates underestimate the total network capacity by at least 50% and that the errors are larger for high-bandwidth and low-uptime relays. Our work suggests that improving Tor’s bandwidth measurement system could improve the network’s performance and better inform plans to handle future growth.