publications

2021

1. IMC

   Measuring DNS-over-HTTPS Performance around the World

   Chhabra, Rishabh, Murley, Paul, Kumar, Deepak, Bailey, Michael, and Wang, Gang

   In Proceedings of the 21st ACM Internet Measurement Conference 2021

   Abs Bib PDF

   In recent years, DNS-over-HTTPS (DoH) has gained significant traction as a privacy-preserving alternative to unencrypted DNS. While several studies have measured DoH performance relative to traditional DNS and other encrypted DNS schemes, they are often incomplete, either conducting measurements from single countries or are unable to compare encrypted DNS to default client behavior. To expand on existing research, we use the BrightData proxy network to gather a dataset consisting of 22,052 unique clients across 224 countries and territories. Our data shows that the performance impact of a switch to DoH is mixed, with a median slowdown of 65ms per query across a 10-query connection, but with 28% of clients receiving a speedup over that same interval. We compare four public DoH providers, noting that Cloudflare excels in both DoH resolution time (265ms) and global points-of-presence (146). Furthermore, we analyze geographic differences between DoH and Do53 resolution times, and provide analysis on possible causes, finding that clients from countries with low Internet infrastructure investment are almost twice as likely to experience a slowdown when switching to DoH as those with high Internet infrastructure investment. We conclude with possible improvements to the DoH ecosystem. We hope that our findings can help to inform continuing DoH deployments.

   @inproceedings{10.1145/3487552.3487849,
     author = {Chhabra, Rishabh and Murley, Paul and Kumar, Deepak and Bailey, Michael and Wang, Gang},
     title = {Measuring DNS-over-HTTPS Performance around the World},
     year = {2021},
     isbn = {9781450391290},
     publisher = {Association for Computing Machinery},
     address = {New York, NY, USA},
     url = {https://doi.org/10.1145/3487552.3487849},
     doi = {10.1145/3487552.3487849},
     booktitle = {Proceedings of the 21st ACM Internet Measurement Conference},
     pages = {351–365},
     numpages = {15},
     location = {Virtual Event},
     series = {IMC '21},
     selected = {true},
     bibtex_show = {true},
     abbr = {IMC},
     pdf = {imc2021-final297.pdf}
   }