Does Red Hat Enterprise Linux support NTP Control Messages?
Environment
- Red Hat Enterprise Linux 5
Issue
- Does Red Hat Enterprise Linux support NTP Control Messages?
Resolution
NTP Control Messages are used for controlling and monitoring NTP servers and it is supported by NTP implementation in Red Hat Enterprise Linux.
NTP Control Messages
In a comprehensive network-management environment, facilities are
presumed available to perform routine NTP control and monitoring
functions, such as setting the leap-indicator bits at the primary
servers, adjusting the various system parameters and monitoring regular
operations.
From Network Time Protocol (Version 3) Specification, Implementation and Analysis
Supporting for these messages is optional so that NTP's major functions, like time synchronization and coordination of time distribution, are not affected regardless the implementation of the control messages.
Support for these messages is not required in order to conform to this
specification
From Network Time Protocol (Version 3) Specification, Implementation and Analysis
With ntpq, send Control Message commands to NTP server:
# ntpq -c peer -n
remote refid st t when poll reach delay offset jitter
==============================================================================
192.160.xx.xx .STEP. 16 u - 1024 0 0.000 0.000 0.000
192.50.xx.xx .STEP. 16 u - 1024 0 0.000 0.000 0.000
120.88.xx.xx .STEP. 16 u - 1024 0 0.000 0.000 0.000
+172.16.xx.xx 66.187.xx.xx 2 u 456 512 377 273.822 0.173 2.189
*10.5.xx.xx .CDMA. 1 u 496 512 377 262.065 0.545 2.371
For more details, refer its manual page:
# man ntpq
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