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Old 03-04-2014, 08:47 PM   #1
pankajd
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Registered: Oct 2008
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ntp server issue


hi,
we have an ntp server to which ~350 clients sync. we could see that ntp server process is running on server:

#####################################
ntpd -u ntp:ntp -p /var/run/ntpd.pid -g
#######################################

however, we do not see any ports opened for ntp service on server:

######################################
netstat -atunlp|grep "LISTEN"|grep ntp
######################################

neither telnet to 123 port of ntpserver is not happening from anywhere. We do not have iptables. Also we have not changed anything in the setup except adding some 50 new clients with same setup. The issue is that, clients are not synced with server and are out of sync. ntp client service is running on all clients. If we try to sync the time with "ntpdate -u <ntp svr ip>" on clients, the time is getting synced. syslog does not show any issues. what could be the issue.

Last edited by pankajd; 03-05-2014 at 12:40 AM.
 
Old 03-05-2014, 05:41 AM   #2
acid_kewpie
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Registered: Jun 2001
Location: UK
Distribution: Gentoo, RHEL, Fedora, Centos
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ntp is a udp protocol, so telnet is useless here.

on a client running ntpd and also on the server itself run "ntpq -pn" and show us the output
 
Old 03-05-2014, 07:43 PM   #3
pankajd
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thanks for the reply.

On ntp server,

[root@svr ~]# ntpq -pn
remote refid st t when poll reach delay offset jitter
==============================================================================
*10.208.3.33 202.186.39.40 2 u 964 1024 377 0.352 8.229 2.552

on ntp client,

[root@cli33 ~]# ntpq -pn
remote refid st t when poll reach delay offset jitter
==============================================================================
*192.168.2.29 10.208.3.33 3 u 911 1024 377 0.272 -6.186 7.968
 
Old 03-06-2014, 07:32 AM   #4
acid_kewpie
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the * at the start says that it IS synced. That looks absolutely fine.
 
  


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