NTP Server and Best Practices

Seven best practices for NTP resiliency

1. Have at least four NTP servers. ...
2. Consider your network layout. ...
3. Ensure stratum architecture is consistent. ...
4. Consider site resilience. ...
5. Don't use the NTP pool exclusively. ...
6. When it comes to redundancy, latency matters. ...
7. Avoid time loops.

1. What is the best NTP server to use?
2. How many NTP servers should I use?
3. How do I protect my NTP Server?
4. Are NTP servers safe?
5. What is the most reliable NTP server?
6. How do I connect to NTP server?
7. Should I run my own NTP server?
8. Can I run my own NTP server?
9. How do I setup a local NTP server?
10. How can NTP attacks be prevented?
11. What is Google's NTP server IP address?
12. What port does NTP use?

What is the best NTP server to use?

mutin-sa/Public_Time_Servers.md

• Google Public NTP [AS15169]: time.google.com. ...
• Cloudflare NTP [AS13335]: time.cloudflare.com.
• Facebook NTP [AS32934]: time.facebook.com. ...
• Microsoft NTP server [AS8075]: time.windows.com.
• Apple NTP server [AS714, AS6185]: ...
• DEC/Compaq/HP: ...
• NIST Internet Time Service (ITS) [AS49, AS104]: ...
• VNIIFTRI:

How many NTP servers should I use?

Setup about 5 servers

To work properly ntpd needs to talk to at least 3 servers ("A man with a watch knows what time it is. A man with two watches is never sure"). For servers in the pool we recommend configuring no less than 4 and no more than 7 servers.

How do I protect my NTP Server?

How to Protect Your NTP Server from Cyberattacks

1. Use Multiple NTP Servers. The easiest thing for a network operator to do is simply configure their clients to use multiple NTP servers on the network. ...
2. Monitor Servers From The Client's Perspective. ...
3. Use NTP Encryption Options. ...
4. Monitor Restarts.

Are NTP servers safe?

NTP is the most commonly used protocol for time synchronization on the Internet. If an attacker can leverage vulnerabilities in NTP to manipulate time on computer clocks, they can undermine the security guarantees provided by these systems.

What is the most reliable NTP server?

For example, Stratum 0 serves as a reference clock and is the most accurate and highest precision time server (e.g., atomic clocks, GPS clocks, and radio clocks.) Stratum 1 servers take their time from Stratum 0 servers and so on up to Stratum 15; Stratum 16 clocks are not synchronized to any source.

How do I connect to NTP server?

Enable NTP

1. Select the Use NTP to synchronize the system time check box.
2. To remove a server, select the server entry in the NTP Server Names/IPs list and click Remove.
3. To add an NTP server, type the IP address or host name of the NTP server you want to use in the text box and click Add.
4. Click OK.

Should I run my own NTP server?

TL;DR: If you want to operate a secure environment you should use your own on-site stratum 1 NTP servers along with authentication. This is the only way to eliminate time spoofing attacks from the outside. Don't reduce your overall security to a stateless and unauthenticated (read: easy-to-spoof) network protocol!

Can I run my own NTP server?

It is possible to run the NTP daemon locally on a machine on your network. ... In this way, the differences in clocks between machines on your network is kept as minimal as possible. Mac, and even Windows boxes are also able to synchronize with an NTP server, should you set one up.

How do I setup a local NTP server?

Start the Local Windows NTP Time Service

1. In the File Explorer, navigate to: Control Panel\System and Security\Administrative Tools.
2. Double-click Services.
3. In the Services list, right-click on Windows Time and configure the following settings: Startup type: Automatic. Service Status: Start. OK.

How can NTP attacks be prevented?

How to Prevent NTP Reflection

1. Scan your NTP server with a vulnerability scanner.
2. Upgrade the NTP daemon if a vulnerability has been detected.
3. If an upgrade is not possible, disable the monlist command or enforce that requests come from valid sources.

What is Google's NTP server IP address?

Google's turned on a set of public network time protocol (NTP) servers. You'll find the servers at time.google.com – which resolves to 216.239. 35.0, a rather less pretty IP address than the 8.8. 8.8 and 8.8.

What port does NTP use?

NTP time servers work within the TCP/IP suite and rely on User Datagram Protocol (UDP) port 123. NTP servers are normally dedicated NTP devices that use a single time reference to which they can synchronize a network. This time reference is most often a Coordinated Universal Time (UTC) source.