NTP ports range, how to block NTP in network?

  Protocol:
NTP
Support: WFilter zh.4.1, WFilter en.4.1, WFilter Free 1.0, WFilter ROS 1.0
  Author: Bruce ModifyTime: 2022-11-10 02:30:04  
      The Network Time Protocol (NTP) is a networking protocol for clock synchronization between computer systems.  

This protocol is official supported. You can install it in "System Settings"->"Protocols" of WFilter.

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"NTP" uses UDP protocol for communication.

UDP traffic analysis

Ports Range

Dynamic ports, no fixed port found.

How to block NTP?

  • Setup a content filter(ie: WFilter), which can block NTP via signature matching.

NTP v1.0(2022-11-10 02:30:04)

● First release

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