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That is to say, a total of false syn messages will occupy the TCP preparation queue for 63s, while the semi-connected queue defaults to 1024, which is different by system default and can be viewed by cat/proc/sys/net/ipv4/tcp_max_syn_backlog c. That is to say, sending 200 fake syn packets per second without any protection is enough to burst the semi-connection queue, thus preventing the real connection from being established and responding to normal requests. The end result is that the server has no time to ignore the normal connection request-denial of service.We know that IPTables acts according to rules. Let's talk about rules. Rules are actually predefined conditions for network administrators. Rules are generally defined as "if the packet header meets such conditions, this packet will be processed in this way". The rules are stored in the packet filtering table in kernel space, specifying the source address, destination address, transport protocol (such as TCP, UDP, ICMP), service type (such as HTTP, FTP, and SMTP), and so on. When packets match the rule, iptables processes these packets according to the methods defined by the rule, such as accept, reject and drop. The main task of configuring a firewall is to add, modify, and delete these rules.特异跑车2007总动员！成龙特技组指导担任电影导演抓狂飙速！　　文革的号角在不经意间吹响，历史的洪流彻底的改变了所有人的命运……慕容瑶被划成黑五类，于振亚被打成走资派。于红趁势做了造反派，成为工厂造反派小头目，而她暗恋的匡逸夫父亲被打成走资派，被关押在他们厂的“小黑屋”中。大串联、自杀、红卫兵、造反、走资派、右派、强奸……轰轰烈烈的年代里，爱情、亲情、友情已经全被被扭曲，或丑陋或纯真的人性表露无遗……　　不仅仅有相互之间的调侃、戏谑、捉弄，也更多了份相互鼓励、帮助、扶持。有美好，有欢笑；有失落，有惆怅；有努力，有奋斗，爱情公寓一如既往的见证了大家的青春与成长，无论是一菲、小贤、关谷、悠悠、子乔、美嘉、益达还是展博，大家的故事...　在第五季中，Mindy Lahiri必须在同事Jody和前未婚夫Danny中做出一个选择，制片人承诺这个选择会让该剧的长期观众感到满意，而且会「开启该剧的新篇章」。无论是哪种情况，Jody和Danny都会在第五季中出现。Nasim Pedrad本季扮演Leo的儿科医生，Bryan Greenberg扮演一名儿科护士（与Mindy和其他医生关系非常紧张）。Rebecca Rittenhouse扮演一个极度自信、金发碧眼的美貌女人，Mindy曾幻想……如果自己足够自信，就应该是这样的女人。遗憾的是，她们并非一见如故，而是一见如敌。Jack Davenport扮演英国戏剧演员、人称「伦敦西区坏男孩」的Leland Breakfast，在百老汇表演独角戏的时候被Mindy看上了……呃，应该说他看上Mindy了。Mindy的母亲和兄弟将在某集中再次出现，观众会看到Mindy童年时代的家。Bill Hader、Anders Holm和B.J. Novak本季将回归，他们的角色都曾是Mindy的「前男友」。BY天涯小筑
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