The Fukuoka University NTP server will stop!

SC2 2018-01-31

2024-05-11

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Fukuoka University has announced that it will perform technical verification for the suspension of the NTP service after April 2018, and that it will be known when the suspension time is decided.

Fukuoka University is a long-established store that began operating the first public NTP service in Japan in October 1993.

Its brand power is spreading all over the world, with 239 countries accessing Fukuoka University's NTP server, and a maximum of 190 Mbps bandwidth is consumed by NTP server traffic.

It has been announced that the operation of the NTP server has been decided to stop because the traffic to the NTP server increases the operation cost of the university network.

Fukuoka University NTP server

If you have set clock.nc.fukuoka-u.ac.jp as the time server on Windows, TClock, etc., please change to an NTP server such as a provider to help reduce the load on the Fukuoka University NTP server.

It seems that 133.100.9.2 is the one with a particularly high load, and there was a description in the document that the network becomes heavy at 0 minutes every hour.

The NTP servers at Fukuoka University are as follows.


NTP server	IP address
clock.nc.fukuoka-u.ac.jp	133.100.9.2 133.100.11.8

Access source?


China	27%
Brazil	17%
Germany	Five%
Argentina	Four%
Spain	Four%
Current Status and Issues of Public NTP Service at Fukuoka University

What is the vendor morals?

According to the Fukuoka University document "Why this happened ? (1)," some network appliances such as TP-LINK have the NTP server address of Fukuoka University embedded in their firmware.

Since TP-LINK is posted as a nuisance case in the research presentation material, it is speculated that Fukuoka University's anger is considerable.

Reference: Regarding access to the NTP server by TP-Link wireless LAN repeater-TP-Link
https://www.tp-link.com/jp/news-details-17792.html

We would like to report on the inquiry that there is excessive access to some NTP servers by our wireless LAN repeater.
This phenomenon occurs because the repeater tries to access the NTP server and confirms whether or not there is an internet connection.

Omission

It is possible to check the Internet connection in real time by checking it frequently, and it is also used to display the connection status on the management screen for the convenience of the user.
This kind of operation is a general behavior in network equipment, but our products frequently cause a load on each NTP server due to this operation.

Currently, we are in the process of contacting various places that provide NTP servers, including Fukuoka University, and working to reduce the load.

I think it's against morals that a commercially available network appliance uses the NTP server of Fukuoka University instead of its own server to check the Internet connection.

If you want to use it, I think you should get approval beforehand.

TP-LINK?

Looking at companies that are against morals ...
China ... (゚ Д ゚)

I understand why the access source No.1 is China. How many of the 800 million shipments have the IP address of the Fukudai NTP server embedded? You can also see that Fukudai wants to give his real name and warn him.

About TP-Link-TP-Link

TP-LINK is a company that develops, manufactures, and sells products with the aim of providing the world's best network products with cost performance. Headquartered in Shenzhen China , direct management subsidiaries and branch offices in 42 countries we are developing.

Since its founding in 1996, TP-LINK has continued to put out innovative products into the world through continuous efforts, and has grown to become the market leader of network products for SOHO and SMEs all over the world.

With more than 800 million cumulative product shipments, we now offer network products to tens of millions of users in over 170 countries.

Afterword

The following are the presentation materials that led Fukuoka University to shut down the NTP server.

Source: Current status and issues of public NTP service at Fukuoka University :: JANOG41

About NTP

The material that explains NTP in an easy-to-understand manner was posted on the enog.jp site.

NTP: Network Time Protocol

Reference: Operation and issues of public NTP server
http://enog.jp/wp-content/uploads/2017/10/20171027_ENOG47_tanizaki.pdf

ntpd gets the time from the time source and keeps the exact time.
The server listens on 123 /UDP, and the client queries on 123 /UDP or unprivileged port /UDP.
Packets exchanged between the server and client are generally "90 bytes".
When ntpd makes a client time inquiry, it sends a lot of inquiry packets if there is no reply from the server.
NTP topics: "Accurate time" and "Distribute time"

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