D-Link DFL-2500 User Guide - Page 117
Time Synchronization
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98 Chapter 11. Date & Time 11.2 Time Synchronization The clock in the product is likely to be fast or slow after a period of operation. This is normal behavior in most network and computer equipment and is commonly solved by utilizing a time synchronization mechanism. The product is able to adjust the clock automatically based on information received from one or several timeservers in the network. Using time synchronization is highly recommended, as it ensures the product to have its date and time aligned with other products in the network, or even with public timeservers providing highly accurate time information based on atomic clocks. 11.2.1 Time Synchronization Protocols The product supports two kinds of protocols to be used for time synchronization: • SNTP - Defined by RFC 2030, The Simple Network Time Protocol (SNTP) is a lightweight implementation of the Network Time Protocol (NTP) described in RFC 1305. • UDP/TIME - The Time Protocol (UDP/TIME) is an older method of providing time synchronization service over the Internet. The protocol provides a site-independent, machine-readable date and time. The time service sends back to the originating source the time in seconds since midnight on January first 1900. Most current public timeservers are using the NTP protocol. 11.2.2 Timeservers Up to three timeservers can be configured to query for time information. By using more than one single server, situations where an unreachable server causes the time synchronization process to fail can be prevented. Please note that the product always queries all configured timeservers in order to compute an average time based on the responses from all servers. Search engines on the Internet can be used to find updated lists of publicly available timeservers. D-Link Firewalls User's Guide