What is Refid in ntpq output?

What is Refid in ntpq output?

NTP’s Reference ID, or REFID, identifies the source of time in a timestamp or time packet. In NTP packets sent over the network the REFID is used to identify the “system peer”, and in the long-term general case its fundamental purpose is to prevent a one-degree timing loop.

What does ntpq output mean?

ntpq: Network Time Protocol Query User Manual. The ntpq utility program is used to monitor the operational status and determine the performance of ntpd , the NTP daemon.

What is offset value in ntpq?

Offset: Offset generally refers to the difference in time between an external timing reference and time on a local machine. The greater the offset, the more inaccurate the timing source is. Synchronised NTP servers will generally have a low offset. Offset is generally measured in milliseconds.

What is the Refid?

The refid is a 32-bit field that identifies the source of time for the data packet. The NTP data packet also includes some timestamps, various other pieces of information, and the stratum of the time source, or the number of layers between the server and its “ultimate” source of time.

What does the column reach mean in ntpq output?

reach: The reach peer variable is an 8-bit shift register displayed in octal format. When a valid packet is received, the rightmost bit is lit. When a packet is sent, the register is shifted left one bit with 0 replacing the rightmost bit.

What is ntpq command in Linux?

The ntpq command queries the NTP servers running on the hosts specified which implement the recommended NTP mode 6 control message format about current state and can request changes in that state. It runs either in interactive mode or by using command-line arguments.

How do I use ntpq?


  1. To start the Network Time Protocol query program in interactive mode, enter: ntpq -i.
  2. To add a time interval of 1000 milliseconds to timestamps, enter: ntpq -c “delay 1000”

How do I use NTPQ?

How do I fix NTP offset?

32519 – NTP Offset Check failure

  1. Verify NTP settings and that NTP sources can be reached. Ensure ntpd service is running.
  2. If ntp peer is reachable, restart the ntpd service.
  3. If problem persists then a reset the NTP date may resolve the issue.
  4. If the problem persists, it is recommended to contact unresolvable-reference.

What does NTP daemon do?

The ntpd program is an operating-system daemon that sets and maintains a computer system’s system time in synchronization with Internet-standard time servers.

How use ntpq Linux?

How to Install and Configure NTP on Linux

  1. Install the NTP service.
  2. Modify the NTP configuration file, ‘/etc/ntp.
  3. Add reference clock peers to the configuration file.
  4. Add drift file location to the configuration file .
  5. Add optional statistics directory to the configuration file .
  6. Enable and start the NTP service.

How do you test for chrony?

To check if chrony is synchronized, use the tracking, sources, and sourcestats commands. Run the chronyc tracking command to check chrony tracking. Alternatively you could run chronyc to display a chronyc> prompt, and then run the tracking command from the chronyc> prompt.