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When the client SYN packet arrives at the filter gateway, the SYN agent does not forward the SYN packet, but actively replies the SYN/ACK packet to the client in the name of the server. If the client's ACK packet is received, it indicates that this is normal access. At this time, the firewall sends the ACK packet to the server and completes three handshakes. The SYN agent actually replaces the server to deal with SYN attacks. At this time, the filter gateway itself is required to have strong ability to prevent SYN attacks.刑事情报高级督察卓凯（苗侨伟 饰）现身泰国曼谷，在当地获得重要情报：九指强与泰国倪坤进行毒品交易。追查之后发现吉运帮黑吃黑将倪坤杀死与九指强进行交易。为寻找吉运帮犯罪证据卓凯与卧底潜入社团窝点后被Pak Key得力手下乐少锋（周柏豪 饰）发现行动，和他们交起手来。逃脱之后卓凯一行人准备离开泰国返回香港时发生一场大爆炸，除了卓凯之外的所有卧底葬身火海。伤心欲绝的卓凯返回香港后面临停职，变得一蹶不振。与此同时香港最大的社团长兴发生内斗，长兴新继任的龙头魏德信（陈豪 饰）以雷厉风行手段剿灭社团的高级头目，其中包括覃欢喜（许绍雄 饰）。然而覃欢喜是长期潜伏在长兴的卧底，面临此番处境，他曾想过向Handler求助调回警察队伍，但妻子突然出事惨死在社团人士手中，令覃欢喜彻底沦入黑道。回忆道：云浩，苏岸，蒲俊还有英布……看出什么没有？尉缭轻声询问。《绝代双骄》是古龙武侠小说的一个里程碑，古龙凭着《绝代双骄》，直接从一流武侠作家迈入超一流的武侠作家。2004年 ルパン三世 盗まれたルパン ～コピーキャットは真夏の蝶～ 被盗的鲁邦~模仿者是盛夏的蝴蝶~一字一句地说道：我再问一遍：郡主在哪里？若不说——眼光一扫，指着一个抱孩子的年轻女人——就从她手上的孩子开始，一个一个杀。From the above analysis, it can be seen that this situation can be counted as situation 2, but I feel that it is clearer and more reasonable to separate it separately. When analyzing situation 4, I will also explain some reasons. At the same time, this is also an application of the first two situations. If I understand situation 1 and situation 2, many other situations not mentioned in this article can be explained.