D-Link DFL-2500 User Guide - Page 118
Maximum Adjustment, Synchronization Interval
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11.2. Time Synchronization 99 11.2.3 Maximum Adjustment To avoid situations where a faulty timeserver causes the product to update its clock with highly erroneous time data, a maximum adjustment value (in seconds) can be specified. If the difference between the current time in the product and the time received from a timeserver is greater than the maximum adjustment value, that timeserver response will be discarded. For example, assume that the maximum adjustment value is set to 60 seconds, and that the current time in the product is 16:42:35. If a timeserver responds with a time of 16:43:38, the difference is 63 seconds, which is not acceptable according to the maximum adjustment. Thus, no update will occur for that response. The default maximum adjustment value is 36,000 seconds. 11.2.4 Synchronization Interval 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 one time per day. Example: Enabling Time Synchronization using SNTP In this example, time synchronization is being setup using the SNTP protocol and using NTP servers installed at the Swedish national laboratory for time and frequency. WebUI : System → Date and Time: Automatic time synchronization Check Enable time synchronization. Select the following from the dropdown lists: Time Server Type: SNTP Primary Time Server: dns:ntp1.sp.se Secondary Time Server: dns:ntp2.sp.se Tertiary Time Server: (None) Click OK. D-Link Firewalls User's Guide
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