D-Link DFL-260E User Manual for DFL-260E - Page 156
Maximum Time Adjustment
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3.9.3. Time Servers Chapter 3. Fundamentals 3. Now enter: • Time Server Type: SNTP • Primary Time Server: dns:ntp1.sp.se • 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. 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. Example 3.28. 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: 2008-02-27 12:24:30 (UTC+00:00) (diff: 158) 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 3.29. 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 156