Contemplating Public NTP Service Issues: How to Terminate Large-scale Infrastructure Service

Do you provide a network service through the Internet? When you started the service, did you consider the repercussions of terminating the service? Fukuoka University provided the first public Network Time Protocol[1][2] (NTP) service using GPS in Japan in October 1993. Since then, NTP traffic has increased significantly increased, the Internet connection has become unstable, making it difficult to provide a suitable education and research network environment for students and faculty. The traffic comes from around the world and we would like to cease the service immediately. However, when we remove the service, the traffic increases several times more, causing the network switch, firewall, and other network equipment to malfunction. In this paper, we will consider issues of terminating a service which has become part of internet infrastructures like the public NTP service, and its various related issues based on various facts.