Fukuoka University provided the first public Network Time Protocol (NTP) service using GPS in Japan in October 1993 to the world. This year will mark 31 years since its commencement of service. Meanwhile, NTP traffic has massively increased, causing both direct and indirect issues for the campus network. In an effort to find the causes and take countermeasures to this issue we have examined the NTP packets, uncovering the necessity and importance of setting up ingress filtering.
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Fujimura et al. (2024) studied this question.
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