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If an attacker sends SYN packets quickly with their own undisguised IP address, this is a so-called direct attack. This attack is very easy to implement because it does not involve spoofing or modifying packets below the user layer of the attacker's operating system. For example, he can simply send many TCP connection requests to implement this attack. However, for this attack to work, the attacker must also prevent his system from responding to SYN-ACK packets because of any ACK, RST, or ICMP (Internet? Control? Message? Protocol) will cause the server to skip the SYN-RECEIVED state (go to the next state) and remove the TCB (because the connection has been successfully established or recycled). Attackers can do this by setting firewall rules, causing the firewall to block all packets (except SYN) to reach the server, or causing the firewall to block all incoming packets so that SYN-ACK packets are discarded before reaching the local TCP handler.再者，身后还有一个苦大仇深的刘邦，万一要是什么时候看自己不爽，来个突然袭击什么的……只有提高军事战斗力，才是最大的保障。倭寇不来，我们不出。东帝大学医院本是国内大学医院中的泰山北斗，近年来却落入了不可告人的行为、医疗失误和派系斗争的泥潭中，评价一落千丈。而夺取新院长之位将强大权力据为己有，计划重新建立医院品牌形象的，不是别人，正是多年来对大门未知子（米仓凉子饰）怀恨在心的野心家蛭间重胜（西田敏行饰）。以“拯救眼前的生命”为己任的未知子被东帝大学医院雇用，深入蛭间重胜执掌的“敌阵”之中。她将面对的是有史以来最危险、最强大的敌人副院长久保东子（泉品子饰）The turn signal must be turned on when the vehicle changes positions, and the only one that cannot be turned on is to enter the roundabout (turntable).韩信退的很快，似乎全然没有了他汉军大元帅的风度和气魄，显得有些狼狈不堪。IOC mode: