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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./moon (Naked Hip)So here, let's talk about iptables for Linux神都战神拓跋羽从边塞带回一个九霄灵狐，关押在府内。此后神都屡屡出现死者诡异的奇案。死者均是神都极美的女子。为了平息此事，拓跋羽悬赏千两召集破案能人，降魔师主动请缨，并大胆质疑此事是妖所为，整个神都震惊。在晴朗明媚的一天，羊村正举行防御系统揭幕仪式，这是慢羊羊村长的最新发明，该系统可以抵制上千伏的电压。谁知这时灰太狼突然出现搅局，不久前他发明了羊味罐头，由此成为当今最炙手可热的科学家，可是没能抓到小羊依然是他心中隐隐的伤痛。灰太狼操纵天气控制器与羊羊特工队展开殊死搏斗。受伤的喜羊羊偶然结识了熊猫旺财，而对方的真实身份是灭绝了许久的蛇。受挫的灰太狼专心升级天气控制器，却忽略了老婆和灰灰的感受，而他的失误也导致天气控制器失控。危难时刻，青青草原的各位意外发现久远以前蛇族发明的诺亚神舟。可是为了启动神舟，必须得到蛇族的帮助。为此，羊羊特工队和机械喜羊羊踏上凶险莫测的冒险旅程……Password length cannot be less than 6 bits.