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

3.8.3. Time Servers
• Secondary Time Server: dns:ntp2.sp.se
4. Click OK
The time server URLs must have the prefix dns: to specify that they should be resolved with a DNS server.
NetDefendOS must therefore also have a DNS server defined so this resolution can be performed.
Example 3.25. Manually Triggering a Time Synchronization
Time synchronization can be triggered from the CLI. The output below shows a typical response.
Command-Line Interface
gw-world:/> time -sync
Attempting to synchronize system time...
Server time: 2008-02-27 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 3.26. Modifying the Maximum Adjustment Value
Command-Line Interface
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 difference
in seconds that an external server is allowed to adjust for. There may be a valid reason why there is a
significant difference such as an incorrect NetDefendOS configuration.
3. Click OK
Sometimes it might be necessary to override the maximum adjustment. For example, if time
synchronization has just been enabled and the initial time difference is greater than the maximum
Note
If the TimeSyncInterval parameter is not specified when using the CLI to set the
synchronization interval, the default of 86400 seconds (equivalent to one day) is used.
2008-02-27 12:24:30 (UTC+00:00) (diff: 158)
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Chapter 3. Fundamentals