![]() This type of attack relies on a certain request being much smaller than the reply. One of the most common and most effective techniques used for DDoS attacks is reflection/amplification. An attacker needs to control a large number of machines that send requests to the target. This is often difficult to accomplish using normal requests. A successful attacker must provide more attack traffic than the target can handle. In the case of distributed denial of service attacks (DDoS), the attacker floods the victim with a large amount of network traffic. How Does the NTP Amplification Attack Work The local server, in turn, synchronizes its clock with reliable internet NTP servers. In most network environments, local devices synchronize time with a local server (like the Domain Controller in Windows environments). Based on these parameters, the NTP client can calculate the time difference between the clock of the NTP server and its own clock. The NTP server replies back with their own time and the time when the packet was sent back. An NTP client sends a request to the NTP server, embedding the client’s own time. The basic principles of time synchronization are pretty simple and straightforward. The latest version of NTP (version 4) is defined in RFC 5905. ![]() It is widely used by servers, mobile devices, endpoints, and network devices, irrespective of their vendor. The Network Time Protocol (NTP) is the standard protocol for time synchronization in the IT industry. ![]()
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