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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.　　但再一次的相遇让两人从敌人，重新变回朋友。童年误会解开后，两人和好如初，学习很好并早已通过大学考试的teh提出帮助oh-aew补习中文。补习的过程中，他们更好地了解彼此，并感到他们曾经从未有过的感觉，感情的种子在心底悄悄发芽。但oh-aew先前暗恋同样学习很好的一位男同学，而teh也追求同班的一位女同学两年，感情的交错至使他们把对彼此的想法藏在心底。我先统一回答一下，国术真实存在，《龙蛇演义》上面写的，至少前四章，都是能真实做到的。心慌之下，他一把搂住林聪腰部。　　这时，纽约市中发生一连窜的怪事。原来实业家马克西米林安•J•威特斯意图征服纽约市，秘密培养了一支远古怪兽组成的军队，加上恶名昭彰的忍者组织Foot Clan，各种黑暗势力又在城市的角落里蠢蠢欲动！故事的主角申智贤（南奎丽 饰），是一个不谙世事、乐观而单纯的富家小姐。沉浸在幸福之中的她，正为自己的婚礼而奔走忙碌，却遭遇一场突如其来的车祸。当她醒来时，发现灵魂脱离身体，而死神的调度员（丁一宇 饰）告诉她，复原必须在49天内找到三滴100%“真诚”的眼泪，但不能让他人知道自己的真实身份。