Cache Me If You Can: Effects of DNS Time-to-Live

Cache Me If You Can: Effects of DNS Time-to-Live
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如果可以的话缓存我:DNS 生存时间的影响

DOI:
10.1145/3355369.3355568
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发表时间:
2019
期刊:
ACM Interent Measurements Conference
影响因子:
--
通讯作者:
Hardaker, Wes
Hardaker, Wes
中科院分区:
--
文献类型:
--
作者:
Moura, Giovane C.;Heidemann, John;Schmidt, Ricardo de;Hardaker, Wes

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DNS依赖于广泛的缓存来获得良好的性能,每个DNS区域所有者必须设置生存时间(TTL)值来控制其DNS缓存。目前,关于如何设置ttl的研究支持的指导相对较少,操作人员必须平衡缓存的冲突需求和配置的敏捷性。由于分布式DNS服务之间的交互,TTL值选择究竟如何影响操作网络是相当具有挑战性的,解析器以不同的方式接收TTL(答案和提示),TTL在多个地方指定(区域及其父胶水),而DNS解析必须具有安全意识。本文首次仔细评估了这些多重相互作用的因素如何影响DNS记录的有效缓存生命周期,并根据我们的发现提供了如何配置DNS ttl的建议。我们针对不同的情况以及在哪些地方必须配置TTL提供了建议。我们表明,较长的ttl在减少延迟方面有很大的希望,将一个国家代码TLD的延迟从183 ms减少到28.7 ms。
DNS depends on extensive caching for good performance, and every DNS zone owner must set Time-to-Live (TTL) values to control their DNS caching. Today there is relatively little guidance backed by research about how to set TTLs, and operators must balance conflicting demands of caching against agility of configuration. Exactly how TTL value choices affect operational networks is quite challenging to understand due to interactions across the distributed DNS service, where resolvers receive TTLs in different ways (answers and hints), TTLs are specified in multiple places (zones and their parent's glue), and while DNS resolution must be security-aware. This paper provides the first careful evaluation of how these multiple, interacting factors affect the effective cache lifetimes of DNS records, and provides recommendations for how to configure DNS TTLs based on our findings. We provide recommendations in TTL choice for different situations, and for where they must be configured. We show that longer TTLs have significant promise in reducing latency, reducing it from 183 ms to 28.7 ms for one country-code TLD.
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