Abstract

Cache Me If You Can: Effects of DNS Time-to-Live Page 1 Cache Me If You Can: Effects of DNS Time-to-Live Giovane CM Moura1,2, John Heidemann3, Wes Hardaker3, Ricardo de O. Schmidt4 AMC IMC 2019 Amsterdam, The Netherlands 2019-10-23 1SIDN Labs, 2TU Delft, 3USC/ISI, 4UPF Page 2 Outline Introduction Parent vs Child Zone configurations and Effective TTL TTLs Use in the Wild Operators Notification Caching (Longer TTL) vs Anycast Shorter vs Longer TTLs Recommendation and Conclusions Page 3 Our research on DNS over the last years Our research on DNS security/stability: • Anycast and DDoS: IMC 2016 [2] • Resolvers: IMC 2017 [5] • Anycast Engineering: IMC 2017 [1] • Caching and DDoS: IMC 2018 [4] • Caching and TTL, and performance: IMC 2019 [3] • (this paper) 1 Page 4 Introduction Page 5 The role of TTL authoritative server resolver user 1 Page 6 The role of TTL Q: google.com? …

Date

2019

Authors

Wes Hardaker