NTP
From ServersCheck Wiki
Description
The new NTP (Network Time Protocol) check (release 7.9.0) enables users to monitor their NTP or Time servers. The NTP check will send a UDP packet to the NTP server and verifies if the return data contains some of the data required as per NTP standards. In particular it checks if the returned data contains "Stratum" - one of the elements of a NTP message.
On following website you can find some more information about the NTP protocol: www.ntp.org
How to perform a NTP check
First create a new rule like explained step by step in following help file article: Define Rules
In the first field enter the IP address or hostname of the NTP server. You can test it against plublic NTP servers:
- Worldwide: pool.ntp.org
- Asia: asia.pool.ntp.org
- Europe: europe.pool.ntp.org
- North America: north-america.pool.ntp.org
- Oceania: oceania.pool.ntp.org
- South America: south-america.pool.ntp.org
The second field is the UDP port on which the NTP server listens. Default value is 123
Click on Test Settings to try out the check you defined.
