How do I authenticate NTP server?

Configuring NTP authentication for client

  1. Enter system view. system-view.
  2. Enable NTP authentication. ntp-service authentication enable.
  3. Configure an NTP authentication key.
  4. Configure the key as a trusted key.
  5. Associate the specified key with an NTP server.

What is the NIST NTP server?

The NIST servers listen for a NTP request on port 123, and respond by sending a udp/ip data packet in the NTP format. The data packet includes a 64-bit timestamp containing the time in UTC seconds since January 1, 1900 with a resolution of 200 ps.

Does NTP require authentication?

NTP authentication works with a symmetric key configured by user. The key is shared by the client and an external NTP server. The servers and clients must agree on the key to authenticate NTP packets. Currently NTP is already supported in CTP devices but NTP authentication is not supported.

Is NTP server secure?

NTP can be secured well with symmetric keys. Unfortunately, the server has to have a different key for each client and the keys have to be securely distributed. That might be practical with a private server on a local network, but it does not scale to a public server with millions of clients.

What is NTP trusted key?

Per Cisco ntp trusted-key. Specifies one or more keys (defined in Step 2) that a time source must provide in its NTP packets in order for the device to synchronize to it. The range for trusted keys is from 1 to 65535.

Which NTP server should I use?

In most cases it’s best to use pool.ntp.org to find an NTP server (or 0.pool.ntp.org, 1.pool.ntp.org, etc if you need multiple server names). The system will try finding the closest available servers for you.

Is NTP traffic encrypted?

The Network Time Protocol utilises MD5 (Message Digest Encryption 5) encrypted keys. MD5 is a commonly used secure encryption algorithm that makes use of a 128-bit cryptographic hash feature.

What are NTP control queries?

NTP communication consists of time requests and control queries. Time requests provide the standard client/server relationship in which a client requests time synchronization from an NTP server. Control queries provide ways for remote systems to get configuration information and reconfigure NTP servers.