How NTP works
Guidelines for implementing NTP
Primary and secondary time server information
The NTP configuration file
NTP association modes
Configuring NTP
Authenticating NTP peers
Authenticating NTP runtime reconfiguration
The NTP driftfile
Restricting access to NTP
Using NTP without access to the Internet
Using ntpdate to set the time
A simple NTP configuration scenario
A complex NTP configuration scenario
Testing and tuning NTP
NTP query commands
Examples of using ntpq and xntpdc
Troubleshooting NTP
Running mixed synchronization subnets
NTP glossary
For more about NTP