NTP Client Sync not working
I have 7 Red Hat servers 5.7 there are 2 NTP Severs based on Windows. These two servers are used by Windows and Linux Machines for time sync...Windows Servers sync fine nut my 7 Red Hat are not
I use the ntpdate -u NTP1 NTP2 and time is sync but one one later time is not sync anymore
In fact I configured them yesterday and today there are one hour ahead....
This is my configuration
1. Configure /etc/ntp.conf
I mean I configured NTP before but in Linux-Linux environment and they have worked....now the clock for these linux is going faster
thanks a lot for any input
not without some useful information... what does "ntpq -pn" say? where are these ntp servers syncing to themselves?
remote refid st t when poll reach delay offset jitter
crcordc01.bacne 10.124.50.52 4 u 936 1024 377 0.887 -22208. 17615.0
crcordc02.bacne 10.124.50.52 4 u 933 1024 377 0.707 -22147. 17667.9
*LOCAL(0) .LOCL. 10 l 5 64 377 0.000 0.000 0.001
I can go today and take the command you asked
about where windows NTP Servers are sync let me find out that for you
well they are syncing to 10.124.50.52 as the output shows. Looks like the time provided is too far off to sync, what happens if you ntpdate again and start ntpd again?
I went onsite.
Some stuff I discovered today. First of all these Linux are Virtual Machines running on Hyper-V in case this is relevant I am mentioning.
Second these are 7 server.
1 Red Hat 5.7 x64 - Sync with external NTPs since it has internet access 0.rhel.pool.ntp.org - 1.rhel.pool.ntp.org This server is working just fine time is always OK. But at this time I don't why is that. I mean
is it because RH 5.7 has better time sync than RH 5.5? or is it because is using this public NTPs?
6 Red Hat 5.5 x64 - These are in a DMZ so they synchronize with 2 Windows Servers which are synchronizing with another NTP Servers in USA and these servers which are in USA are synchronizing with public NTPs like the ones above.
now let me show you some output of the ntpq -pn command
As you can see NTP 18.104.22.168 is being used as NTP Server
As you can see I waited for about 30-45 minutes and 127.127.1.0 always was the source
you know the 10.x.x.x should be elected in order to be an external NTP server to sync with but these 2 servers never got sync with the NTP servers configured in its ntp.conf
now /etc/ntp.conf is identical for RH 5.7 and RH 5.5 obviously NTP Servers changes.
and iptables and ip6tables are stopped
any input or ideas guys?
thanks a lot
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