Abstract
We present a list of the Best-50 public IPv4 time servers by mining a high-resolution dataset of Stratum-1 servers for Availability, Stratum Constancy, Leap Performance, and Clock Error, broken down by continent. We find that a server with ideal leap performance, high availability, and low stratum variation is often clock error-free, but this is no guarantee. We discuss the relevance and lifetime of our findings, the scalability of our approach, and implications for load balancing and server ranking.
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References
Archipelago monitor locations. http://www.caida.org/projects/ark/locations/
Bajpai, V., Schönwälder, J.: A survey on internet performance measurement platforms and related standardization efforts. IEEE Commun. Surv. Tutorials 17(3), 1313–1341 (2015)
Brittain, S., Böhning, D.: Estimators in capture-recapture studies with two sources. AStA Adv. Stat. Anal. 93(1), 23–47 (2009)
Cao, Y., Veitch, D.: TimeServer Dataset 2016–2017. https://data.research.uts.edu.au/public/DVTSD/. Per-server results also available
Cao, Y., Veitch, D.: Network timing, weathering the 2016 leap second. In: Proceedings of IEEE INFOCOM 2018, Honolulu, USA, 15–19 April 2018
Guyton, J.D., Schwartz, M.F.: Experiences with a Survey Tool for Discovering Network Time Protocol Servers (1994). Accessed 31 July 2015
Hong, C.-Y., Lin, C.-C., Caesar, M.: Clockscalpel: understanding root causes of internet clock synchronization inaccuracy. In: Spring, N., Riley, G.F. (eds.) PAM 2011. LNCS, vol. 6579, pp. 204–213. Springer, Heidelberg (2011). https://doi.org/10.1007/978-3-642-19260-9_21
Malone, D.: The leap second behaviour of NTP servers. In: Proceedings of the Traffic Monitoring and Analysis workshop, 7–8 April 2016. IFIP Digital Library (2016). http://tma.ifip.org/2016/#program
Minar, N.: A Survey of the NTP Network (1999). http://xenia.media.mit.edu/ nelson/research/ntp-survey99/ntp-survey99-minar.ps
Murta, C., Torres, P., Mohapatra, P.: Characterizing quality of time and topology in a time synchronization network. In: Global Telecommunications Conference, GLOBECOM 2006, pp. 1–5 (2006). IEEE, November 2006
ntp.org. NTP Pool Project (2018). Accessed 2 May 2018
pool.ntp.org. How do I use pool.net.org? http://www.pool.ntp.org/en/use.html
pool.ntp.org. NTP Pool server selection. http://support.ntp.org/bin/view/Servers/NTPPoolServers
Staff, R.N.: Ripe atlas: a global internet measurement network. Internet Protoc. J. 18(3) (2015)
Sutherland, W.J.: Ecological Census Techniques: A Handbook. Cambridge University Press, Cambridge (2006)
Veitch, D., Ridoux, J., Korada, S.B.: Robust synchronization of absolute and difference clocks over networks. IEEE/ACM Trans. Netw. 17(2), 417–430 (2009)
Veitch, D., Vijayalayan, K.: Network timing and the 2015 leap second. In: Proceedings of PAM 2016, Heraklion, Crete, Greece, 31 March - 1 April 2016
Vijayalayan, K., Veitch, D.: Rot at the roots? Examining public timing infrastructure. In: Proceedings of IEEE INFOCOM 2016, San Francisco, CA, USA, 10–15 April 2016
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Partially supported by Australian Research Council’s Discovery Projects funding scheme #DP170100451.
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Cao, Y., Veitch, D. (2019). Where on Earth Are the Best-50 Time Servers?. In: Choffnes, D., Barcellos, M. (eds) Passive and Active Measurement. PAM 2019. Lecture Notes in Computer Science(), vol 11419. Springer, Cham. https://doi.org/10.1007/978-3-030-15986-3_7
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