How to get NTP client logs on NTP server

LinuxLover · 03-23-2015, 06:50 AM

Hello folks,
We are manging a NTP server on RHEL 6.
NTP version Ver. 4.2.6p5
This is the ntp.conf file.

Code:

$ cat /etc/ntp.conf
server 213.X.X.X iburst
server 195.X.X.X iburst

driftfile /var/lib/ntp/ntp.drift
logfile /opt/ntp/ntp.log
restrict default kod nomodify notrap nopeer noquery
restrict 127.0.0.1
restrict -6 ::1

logconfig =syncevents +peerevents +sysevents +allclock
statistics clockstats cryptostats loopstats peerstats

Is there any way to captured the NTP client logs which are syncing time with our NTP server. Our log file so for containg NTP server daemon related logs only.

pan64 · 03-23-2015, 08:55 AM

I'm sorry, but do not understand it. clients are running on other hosts and you can log their activity on their own hosts (or you can try remote logging if configured).

LinuxLover · 03-23-2015, 09:18 AM

Dear pan64,
We just want to log all ntp client request along with their time, IP , sync status etc which are reaching on our NTP server. So time client complaints that your NTP server was not available for short period of time, and for that time we were not sure whether their request was reached to server or not. We have to use tcpdump most of the time for troubleshooting.

pan64 · 03-24-2015, 01:34 AM

here are the ports you need to take into account: http://www.computerports.net/ntp-port/
and here is a thread about logging: http://ubuntuforums.org/showthread.php?t=2156003

LinuxLover · 03-24-2015, 08:15 AM

Thanks pan64,
By using your link I am able to log client requests through iptables daemon. But I tried hard to find out any NTP server builtin mechanism to log client request , it looks like some how it does not provide such functionality. If any one knows please share.

pan64 · 03-24-2015, 08:21 AM

are you thinking about ntp_mon ?

LinuxLover · 03-26-2015, 05:44 AM

Thanks pan64.
Let me explore this.