- NTP official reference implementation (for Unix and Unix-like OSes, with ports to Microsoft Windows NT, VMS, real-time OSes like VxWorks and QNX, etc...). Also jumping-off point to the official NTP documentation and FAQ, community documentation tools (twiki), pool.ntp.org, and related project
Vendor: endruntechnologies.com: Introduction to NTP - Four page document that gives a very simple high-level overview of how NTP works and some of the issues to be considered when looking to set up NTP time servers. This company is a vendor of NTP time servers and related hardware. [PDF
Flawed Routers Flood University of Wisconsin Internet Time Server - Report by Dave Plonka on the massive problems caused on the University of Wisconsin network and time servers, due to misconfiguration of NetGear equipmen
RFC2030 - Simple Network Time Protocol Version 4 - The current standard for SNTP, a version of the protocol for implementations which do not need all of the features of NTP. Available here in HTML, PDF, and Postscript formats