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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.再瞧不起，是亲儿子。2004年，陈立生凭借自身的不懈努力和过硬的综合素质，被组织上提拔为县交通局局长。坐在宽敞的办公室里，执掌着全县上千万的公路建设大权，陈立生时常还会想起过去的一些事情。陈立生的父亲是一位参加过抗美援朝的老战斗英雄。从朝鲜回来后，父亲在家乡当了一辈子村支书。1969年，母亲因工殉职时，立生发誓要像父母那样做一个对人民有用、受人民敬重的人。(1) Driving along the general direction of the ships in the corresponding navigation lane;今日乃是汉国的大朝议，诸多官员一同出席，隐约之间似乎也是决定汉国生死存亡的一次朝议。