Abstract

DNS latency is a concern for many service operators: CDNs exist to reduce service latency to end-users but must rely on global DNS for reachability and load-balancing. Today, DNS latency is monitored by active probing from distributed platforms like RIPE Atlas, with Verfploeter, or with commercial services. While Atlas coverage is wide, its 10k sites see only a fraction of the Internet. In this paper we show that passive observation of TCP handshakes can measure live DNS latency, continuously, providing good coverage of current clients of the service. Estimating RTT from TCP is an old idea, but its application to DNS has not previously been studied carefully. We show that there is sufficient TCP DNS traffic today to provide good operational coverage (particularly of IPv6), and very good temporal coverage (better than existing approaches), enabling near-real time evaluation of DNS latency from real clients. We also …

Metadata

publication

International Conference on Passive and Active Network Measurement, 264-292, 2022

year

2022

publication date

2022/3/22

authors

Giovane CM Moura, John Heidemann, Wes Hardaker, Pithayuth Charnsethikul, Jeroen Bulten, João M Ceron, Cristian Hesselman

link

https://link.springer.com/chapter/10.1007/978-3-030-98785-5_12

resource_link

https://par.nsf.gov/servlets/purl/10420146

book

International Conference on Passive and Active Network Measurement

pages

264-292

publisher

Springer International Publishing