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2. Testers3. The third handshake: the client receives the SYN + ACK message segment from the server. Then the Acknowledge Number is set to y+1, and the ACK message segment is sent to the server. After the message segment is sent, both the client and the server enter the ESTABLISHED state, completing the TCP three-time handshake.张槐没有应声，神情呆呆地。WIN2000: In addition to the parameters of TcpMaxHalfOpen and TcpMaxHalfOpenRetrieved described above, WIN2000 operating system can increase the maximum number of half connections that the system can accommodate by setting dynamic backlog (dynamic backlog). Configuring dynamic backlog is completed by AFD.SYS driver, which is a kernel-level driver and is used to support window socket-based applications such as ftp, telnet, etc. Location of AFD.SYS in the registry:14. X.X.173On the one hand, the core components of the network infrastructure have never changed in the past ten years, which makes some discovered and exploited vulnerabilities and some mature attack tools have a long life cycle and are still valid even today. On the other hand, the rapid development of the application of the Internet seven-layer model has diversified the attack targets of DDoS. From the web to DNS, from the three-layer network to the seven-layer application, from the protocol stack to the application App, the endless new products have also given hackers more opportunities and breakthrough points. Moreover, DDoS protection is a project with unequal technology and cost. Often, the construction cost of a business's DDoS defense system is larger than the cost or benefit of the business itself, which makes many start-up companies or small Internet companies unwilling to make more investment.