Sho Fujimura
Fuminori Tanizaki
ABSTRACT
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.
In this paper, we outline the open NTP service as well as its traffic, examining packets and the necessity for ingress filtering.
Index Terms
- Fukuoka University public NTP service and BCP38
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