Details of the Inquiry
We operate small factories not only in Korea but also in about 10 countries around the world, and we have obtained ISO/IEC 27001 and ISMS certification and operate an ISMS with a small staff. Among the information security requirements is NTP Server configuration, but a web search mentions only bora.net, kornet, and similar servers. Is there a list of NTP Servers whose security has been verified and that are easy to manage, for configuring the NTP Servers of servers at about 10 factories worldwide, including Europe as well as Korea?
We recommend the NTP Pool Project.
The NTP Pool Project started as a forum in 2003 and is a large NTP Server network that organizes NTP Server pools in clusters around the world. This large project is made more trustworthy because Packet and NetActuate, well-known companies familiar to engineers, provide server hosting and bandwidth. In addition, you can currently configure 4,576 NTP Servers by continent around the world as your own, so a global company can secure accuracy, security, and ease of management and operation. If you can meet the specific conditions set by this project, you can also join a server you own as an NTP server using a very small amount of resources (on the order of 5 to 15 NTP packets sent and received per second).
How to Configure an NTP Server Using the NTP Pool
For installing the ntp package and the other steps required to configure an NTP Server, refer to the well-organized documents found through a web search. As an example of using NTP Pool Project servers, a server located in Korea can use 352 NTP servers without interruption by registering the following in the ntp.conf file.
server 0.asia.pool.ntp.org server 1.asia.pool.ntp.org server 2.asia.pool.ntp.org server 3.asia.pool.ntp.org
If you configure the NTP Server for a server located in Europe, the following settings let you use 2,995 NTP servers.
server 0.europe.pool.ntp.org server 1.europe.pool.ntp.org server 2.europe.pool.ntp.org server 3.europe.pool.ntp.org
In this way, depending on the continent, you can use about 4,576 NTP Servers across Africa, Asia, Europe, North America, South America, and Oceania.
For further details, please refer to https://www.ntppool.org/ .
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