Exploring the potential benefits of expanded rate limiting in Tor: slow and steady wins the race with Tortoise
Exploring the potential benefits of expanded rate limiting in Tor: slow and steady wins the race with Tortoise
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探索 Tor 中扩大速率限制的潜在好处：缓慢而稳定地赢得与 Tortoise 的竞争
DOI：
10.1145/2076732.2076762
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发表时间：
2011
期刊：
影响因子：
2.9
通讯作者：
M. Sherr
中科院分区：
文献类型：
--
作者：
W. Brad Moore;Chris Wacek;M. Sherr
Tor是志愿者运营的应用层中继器网络，使用户能够私下和匿名进行通信。不幸的是，由于客户端与可用中继的比例不平衡而导致的拥塞，以及一小部分文件共享用户对网络容量的不成比例的高消耗，ToR经常表现出较差的性能。
本文论证了一个非常违反直觉的概念，即降低ToR上的流量将增加网络的带宽容量，从而改善交互式Web用户的体验。我们介绍了Tortoise，这是一种在入口点限制ToR的速率的系统。我们证明了Turtoise对交互式Web用户的影响很小，同时显著降低了文件共享者的吞吐量。我们的技术激励文件分享者配置他们的ToR客户端，使其也转发流量，从而提高网络的整体性能。我们给出的大规模仿真结果表明，即使只有一小部分客户端选择运行中继，交互式用户也将实现显著的加速比。
Tor is a volunteer-operated network of application-layer relays that enables users to communicate privately and anonymously. Unfortunately, Tor often exhibits poor performance due to congestion caused by the unbalanced ratio of clients to available relays, as well as a disproportionately high consumption of network capacity by a small fraction of filesharing users.
This paper argues the very counterintuitive notion that slowing down traffic on Tor will increase the bandwidth capacity of the network and consequently improve the experience of interactive web users. We introduce Tortoise, a system for rate limiting Tor at its ingress points. We demonstrate that Tortoise incurs little penalty for interactive web users, while significantly decreasing the throughput for filesharers. Our techniques provide incentives to filesharers to configure their Tor clients to also relay traffic, which in turn improves the network's overall performance. We present large-scale emulation results that indicate that interactive users will achieve a significant speedup if even a small fraction of clients opt to run relays.