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Last update: March 21, 2023 19:30 UTC (001a25414)

Build and Install

• Basic Installation
• Building and Installing the Distribution
• Build Options
• Debugging Reference Clock Drivers
• Quick Start
• NTP Version 4 Release Notes
• NTP Debugging Techniques
• NTP Bug Reporting Procedures

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Program Manual Pages

• ntpd - Network Time Protocol (NTP) daemon
• ntpq - standard NTP query program
• ntpdc - special NTP query program
• ntpdate - set the date and time via NTP
• sntp - Simple Network Time Protocol (SNTP) client
• ntptrace - trace a chain of NTP servers back to the primary source
• tickadj - set time-related kernel variables
• ntptime - read and set kernel time variables
• ntp-keygen - generate public and private keys
• ntpdsim - Network Time Protocol (NTP) simulator
• ntp-wait -waits until ntpd is in synchronized state
• ntp_conf - Configuration File Definition (Advanced)

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Handbook Pages

• NTP Version 4 Release Notes
• Command Index
• Access Control Support
• Association Management
• Authentication Support
• Automatic Server Discovery Schemes Timekeeping
• Rate Management
• Reference Clock Support

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Client and Server Configuration

• Association Management
• Automatic Server Discovery Schemes

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Reference Clock Support

• External Clock Discipline and the Local Clock Driver
• How to Write a Reference Clock Driver
• How to build new PARSE clocks
• Reference Clock Drivers

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Reference Clock Audio Drivers

• IRIG Audio Decoder
• Radio CHU Audio Demodulator/Decoder
• Radio WWV/H Audio Demodulator/Decoder
• Reference Clock Audio Drivers

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Miscellaneous Pages

• Copyright Notice
• Event Messages and Status Words
• Kernel Model for Precision Timekeeping
• ntpd System Log Messages
• PPSAPI Interface for Precision Time Signals
• Pulse-per-second (PPS) Signal Interfacing

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Special Topics

• How NTP Works
• Mitigation Rules and the prefer Keyword
• Autokey Public-Key Authentication
• Orphan Mode
• NTP Interleaved Modes
• Huff-n'-Puff Filter
• Clock Filter Algorithm
• Clock Select Algorithm
• Clock Cluster Algorithm
• Mitigation Rules and the prefer Keyword
• Clock Discipline Algorithm
• Poll Process
• Clock State Machine
• Leap Second Processing

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Other Links

• Computer Network Time Synchronization - The Network Time Protocol (book)
• NTP Research Project (home page)
• Executive Summary: Computer Network Time Synchronization
• The NTP Timescale and Leap Seconds
• NTP Timestamp Calculations
• The NTP Era and Era Numbering
• Timestamp Capture Principles
• Analysis and Simulation of the NTP On-Wire Protocols
• Time Synchronization for Space Data Links
• NTP Security Analysis
• IEEE 1588 Precision Time Protocol (PTP)
• Autonomous Configuration
• Autonomous Authentication
• Autokey Protocol
• Autokey Identity Schemes