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A Longitudinal View of Netflix: Content Delivery over IPv6 and Content Cache Deployments

机译：Netflix的纵向视图：通过IPv6进行内容交付和内容缓存部署

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We present an active measurement test (netflix) that downloads content from the Netflix content delivery network. The test measures latency and achievable throughput as key performance indicators when downloading the content from Netflix. We deployed the test on ~100 SamKnows probes connected to dual-stacked networks representing 74 different origin ASes. Using a ~2.75 year-long (Jul 2016–Apr 2019) dataset, we observe Netflix Open Connect Appliance (OCA) infrastructure to be highly available, although some vantage points experience low success rates connecting over IPv6. We witness that clients prefer connecting to Netflix OCAs over IPv6, although the preference over IPv6 tends to drop over certain peak hours during the day. The TCP connect times toward the OCAs have reduced by ~40% and the achievable throughput has increased by 20% over the measurement duration. We also provision scamper right after the netflix test to capture the forwarding path toward the Netflix OCAs. We observe that the Netflix OCA caches deployed inside the ISP are reachable within six IP hops and can reduce IP path lengths by 40% over IPv4 and by half over IPv6. Consequently, TCP connect times are reduced by 64% over both address families. The achieved throughput can~ also increase by a factor of three when such ISP caches are used to stream content. This is the first study to measure Netflix content delivery from residential networks, since the inception of the Netflix CDN infrastructure in 2011. To encourage reproducibility of our work, an anonymized version of the entire longitudinal dataset is publicly released.
机译：我们提供了一个主动的测量测试（netflix），该测试可以从Netflix内容分发网络下载内容。该测试将延迟和可达到的吞吐量作为从Netflix下载内容时的关键性能指标。我们在约100个SamKnows探针上部署了该测试，这些探针连接到代表74个不同起源AS的双栈网络。使用大约2.75年（2016年7月至2019年4月）的数据集，我们观察到Netflix Open Connect Appliance（OCA）基础设施具有很高的可用性，尽管某些优势在通过IPv6进行连接时成功率很低。我们看到，尽管在一天中的某些高峰时段，对IPv6的偏好会下降，但客户端更喜欢通过IPv6连接到Netflix OCA。在整个测量期间，到OCA的TCP连接时间减少了约40％，可达到的吞吐量增加了20％。在netflix测试之后，我们还立即提供了scamper，以捕获指向Netflix OCA的转发路径。我们观察到，部署在ISP中的Netflix OCA缓存在六个IP跃点内是可以访问的，并且可以将IP路径长度在IPv4上减少40％，在IPv6上减少一半。因此，两个地址族的TCP连接时间都减少了64％。当使用此类ISP缓存流式传输内容时，所达到的吞吐量也可以增加三倍。自2011年Netflix CDN基础设施问世以来，这是衡量居民网络中Netflix内容交付情况的第一项研究。为了鼓励我们工作的可重复性，公开发布了整个纵向数据集的匿名版本。

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