LDAPWiki: Verify Time is Synchronized

Overview #

Many network services are dependent on time synchronization.This is a short Cheat Sheet to Verify Time is Synchronized

Verify Time Windows#

You can manually synchronize a computer with the time on the domain. To force synchronize the computer's time manually with the current time on the domain

Click Start
click Run.
net time /domain /set
click OK.

You can also monitor the time by using:

w32tm /monitor
SERVER1.yourdomain.com[10.178.136.20:123]:
    ICMP: 40ms delay
    NTP: -0.0151674s offset from SERVER1.yourdomain.com
        RefID: server.yourroot.com [10.92.180.175]
        Stratum: 3
SERVER2.yourdomain.com[10.182.255.64:123]:
    ICMP: 20ms delay
    NTP: +0.0074253s offset from SERVER2.yourdomain.com
        RefID: server.yourroot.com [10.92.180.175]
        Stratum: 3
SERVER3.yourdomain.com *** PDC ***[10.92.180.167:123]:
    ICMP: 3ms delay
    NTP: +0.0000000s offset from SERVER3.yourdomain.com
        RefID: server.yourroot.com [10.92.180.175]
        Stratum: 3
        <!-- Remaining Content suppressed for brevity -->

Verify Time Linux#

For most Linux and UNIX hosts:

ntpq -p
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
 LOCAL(0)        .LOCL.          10 l   30   64  377    0.000    0.000   0.000
+ntpserver1.yourdoamin .GPS.            1 u  193 1024  377    1.990   -0.627   0.201
+ntpserver2.yourdoamin .GPS.            1 u  316 1024  377    1.851   -0.590   0.049
-ntpserver1.yourdoamin .GPS.            1 u   22 1024  377    0.610   -0.531   0.046
*ntpserver1.yourdoamin .GPS.            1 u   11 1024  377    0.496   -0.589   0.022

EDirectory Tree#

You should regularly check that Time sync is correct within your EDirectory Tree

We use the following command:

/opt/novell/eDirectory/bin/ndsrepair -T

Typical output is:

---------------------------+---------+---------+-----------+--------+-------
                              DS      Replica   Time        Time is     Time
Server name                 Version   Depth     Source      in sync      +/-
---------------------------+---------+---------+-----------+--------+-------
Processing server: .bratton.srv.willeke.com
.bratton.srv.willeke.com    20601.18    0       Non-NetWare Yes            0
Processing server: .sa.svr.willeke.com
.sa.svr.willeke.com         20601.18    0       Non-NetWare Yes            0
---------------------------+---------+---------+-----------+--------+-------

All servers shown in the time sync screen should show as YES

NOTE: vmware servers or servers on wan link may be shown as not in (quite) sync.

Many people use NTP others use SNTP to maintain Time sync.

More Information#

There might be more information for this subject on one of the following: