Internet Timekeeping Around the Globe

David L. Mills

Abstract:	This paper describes a massive survey of Network Time Protocol (NTP) servers and clients in order to discover statistics of time and frequency mm, as well as determine the health and welfare of the NTP synchronization subnet operating in the global Internet. Among the conclusions of the survey are that most NTP clocks are within 21 ms of their synchronization sources and all are within 29 ms on average. However, additional errors up to one-half the roundtrip delay are possible, but relatively rare. There is, however, a disturbing incidence of improperly operating sewers and misguided server configurations.
Published in:	Proceedings of the 29th Annual Precise Time and Time Interval Systems and Applications Meeting December 2 - 4, 1997 Sheraton Long Beach Hotel Long Beach, California
Pages:	365 - 372
Cite this article:	Mills, David L., "Internet Timekeeping Around the Globe," Proceedings of the 29th Annual Precise Time and Time Interval Systems and Applications Meeting, Long Beach, California, December 1997, pp. 365-372.
Full Paper:	ION Members/Non-Members: 1 Download Credit Sign In