Modifying The Maximum Adjustment Value; Forcing Time Synchronization - D-Link NetDefend DFL-210 User Manual

3.8.2. Time Servers
CLI
gw-world:/> time -sync
Attempting to synchronize system time...
Server time: 2007-02-27 12:21:52 (UTC+00:00)
Local time:
Local time successfully changed to server time.
Maximum Time Adjustment
To avoid situations where a faulty Time Server causes the clock to be updated with a extremely
inaccurate time, a Maximum Adjustment value (in seconds) can be set. If the difference between the
current NetDefendOS time and the time received from a Time Server is greater than this Maximum
Adjustment value, then the Time Server response will be discarded. For example, assume that the
maximum adjustment value is set to 60 seconds and the current NetDefendOS time is 16:42:35. If a
Time Server responds with a time of 16:43:38 then the difference is 63 seconds. This is greater than
the Maximum Adjustment value so no update occurs for this response.
Example 3.25. Modifying the Maximum Adjustment Value
CLI
gw-world:/> set DateTime TimeSyncMaxAdjust=40000
Web Interface
1. Go to System > Date and Time
2. For the setting Maximum time drift that a server is allowed to adjust, enter the maximum time drift in
seconds that a server is allowed to adjust for
3. Click OK
Sometimes it might be necessary to override the maximum adjustment, for instance, if time
synchronization has just been enabled and the inital time difference is greater than the maximum
adjust value. It is then possible to manually force a synchronization and disregard the maximum
adjustment parameter.
Example 3.26. Forcing Time Synchronization
This example demonstrates how to force time synchronization, overiding the maximum adjustment setting.
CLI
gw-world:/> time -sync -force
Synchronization Intervals
The interval between each synchronization attempt can be adjusted if needed. By default, this value
is 86,400 seconds (1 day), meaning that the time synchronization process is executed once in a 24
hour period.
2007-02-27 12:24:30 (UTC+00:00) (diff: 158)
85
Chapter 3. Fundamentals