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SYN attack is a kind of DOS attack. It takes advantage of TCP protocol defects and consumes CPU and memory resources by sending a large number of semi-connection requests. SYN attacks can not only affect hosts, but also harm network systems such as routers and firewalls. In fact, SYN attacks can be implemented as long as these systems turn on TCP services no matter what systems are targeted. As can be seen from the above figure, the server receives the connection request (syn=j), adds this information to the unconnected queue, and sends the request packet to the client (syn=k, ack=j+1), then enters the SYN_RECV state. When the server does not receive an acknowledgement packet from the client, it retransmits the request packet and does not delete this entry from the non-connection queue until the timeout. With IP spoofing, SYN attacks can achieve good results, Typically, clients forge a large number of non-existent IP addresses in a short period of time, SYN packets are continuously sent to the server, and the server replies to the confirmation packets and waits for the confirmation of the customer. Since the source address does not exist, the server needs to continuously resend until it timeout. These forged SYN packets will occupy the unconnected queue for a long time, normal SYN requests will be discarded, the target system will run slowly, and in serious cases, the network will be blocked or even the system will be paralyzed.张老太太和郑氏忙碌待客自不必说，就是刘氏也帮着支应。资深花钮导师郭罗美兰(鲍起静饰)独力养大儿孙，70岁生日前发现各人的烦恼。长子郭得勤(马德钟饰)生意失败兼与妻子田羽菲(唐诗咏饰)离婚；二女郭得宝(车婉婉饰)与儿子郭景轩(胡㻗饰)关系疏离，又与现任男友分手；幼子郭得明(杨明饰)被得勤所累而失业。美兰正想帮儿女解决问题，又计划与爱徒庄致澄(王君馨饰)合作传承手艺，正在此时得勤与弟妹间的矛盾凸显，此时黑道中人郭忠石(关礼杰饰)突然出现，声称拥有郭家单位一半业权……美兰坚持的郭家精神“一定有路行”，能否团结一家人对抗外敌？哎呀。他们越狱后，豹强主张到家驹随口编出来的家乡躲避，幸得杨建华提前安排，才没有漏出马脚，杨建华自称家驹妹妹，与他们同行。他们来到香港见到了集团的老大猜霸，顺利成为集团的一员。猜霸带着手下前往吉隆坡营救被绑架的妻子，遇到了家驹的女友阿美（张曼玉 饰）。阿美不知家驹正在执行任务，以为他和杨建华在偷情。阿美的举动引起了集团成员的怀疑，连场大战一触即发！近未来某一年，地球爆发毁灭性极大的致命病毒，从而导致全球超过半数的人口死亡。一望无际的茫茫大海，似乎成为病毒无法涉足的神域，而汤姆·坎德勒船长（埃里克·迪恩 Eric Dane 饰）所统领的阿利·伯克级驱逐舰导弹驱逐舰“内森-詹姆斯”号，则成为天罚过后漫无目的漂流并等待赦免的诺亚方舟。为了保存有生力量，同时确保船上的两名滤过性病原体学者研制出抗毒解药，坎德勒船长违抗了美国临时政府的召唤，带着船员踏上漫漫征途。然而一路上凶险倍至，为了补寄和疫苗，他们不得不停靠港口和陆地，除此之外更有他国的船舰试图抢夺解药。更可怕的是，绝望和恐慌也在船员间蔓延。看不到未来的旅程，何日才是尽头……本片根据同名小说改编。