@mathourthy Good question. They have zero effect from what I can see. It’s not going to stop them from targeting anyone else.
@周林锋 DDoS attacks are typically mitigated at the ISP or Firewall level, and should not be actioned at the server level ideally - however, most of this depends on the type of DDoS attack.
For example, Layer 2 and 3 type attacks (Data and Network from the OSI Model) should always be handled by any traversing path other than the server itself - see below
In this case, the ISP itself, or the firewall sitting in front of the server should have mitigation processes in place to prevent this type of attack hitting your server directly. Layer 7 attacks are different in their approach, and typically target the application directly. To avoid this, you should deploy a Web Application Firewall (WAF) that can filter out these types of attacks.
Essentially, the “easy” choice here is Cloudflare, although I note that your server is potentially located in China, so this may not be an option - although AWS (operated by Sinnet) is available - more information here
If you can provide more information around the infrastructure you have (not here, but via PM for security reasons), I can guide you further.