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The SYN-Flood attack is currently the most common DDoS attack on the network, It is also the most classic denial of service attack. It takes advantage of a defect in the implementation of TCP protocol. By sending a large number of attack messages with forged source addresses to the ports where the network service is located, it may cause the half-open connection queue in the target server to be full, thus preventing other legitimate users from accessing. This kind of attack was discovered as early as 1996, but it still shows great vitality. Many operating systems, even firewalls and routers, cannot effectively defend against this kind of attack, and it is very difficult to trace it because it can easily forge the source address. Its packet characteristics are usually that the source sends a large number of SYN packets and lacks the last handshake ACK reply of the three handshakes.爱与遗憾的套路，但是又包含笑中带泪，很治愈。一对侦探和恋人过着幸福的生活，他们彼此相爱、并且在工作中配合得相得益彰，屡立战功。然而，在一次恐怖的鲨鱼袭击之后，两个人经历了惨痛的伤害，险些双双丧命，最终幸运的存活下来。经历了这次意外的遭遇和重创，他们的身体和心理都留下了很大的创伤和阴影，之前的幸福生活也发生了彻底的改变。多年之后，命运让他们再次聚集在一起，并且重操旧业，追捕最危险的犯罪分子，面对连环杀手的围追堵截，他们通力合作，与黑暗势力展开了殊死搏斗。依下官看来，这分明就是家事。However, that implementation of individual step at a more detailed level may differ, and we usually consider use the template method pattern to handle it本将军说了，没空跟你啰嗦。直到这时候，秦淼才觉得背上火辣辣的疼。