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Most routers working in the Internet support NTP and register the current accurate time on the NTP control message. But how precisely the time is maintained depends on the topology and/or load of mutual references of NTP. We implemented the application to send continuously NTP control messages with variable time intervals. We experimented to watch the behavior of the NTP daemon and then we can get the following results of the clock offset. First, we extracted effects of the dock offset maintained by different types of stratum servers. We have 0.133 msec/sec drift on the host with no support of NTP. Second, we extracted two cyclic jitters of clock offset on the stratum 1 server. One long cyclic interval is 50 second and the other is 2 second. Finally, we compared between the clock offset on the local stratum 2 server and the remote(long network distance) stratum 2 server and extracted the element of precision of the clock offset.