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I hope it is what you want.When the invariant and variable behaviors are mixed together in the subclass implementation of the method, the invariant behaviors will repeat in the subclass. We move these behaviors to a single place through the template method pattern.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.Now you can do some tests:张槐想了想，低声道：不如这样，咱们先等一会。个中国版的《雨人》。1940年，日本占领下的上海，英法德租界成为“孤岛”，一个在教会学校读书，精通英语及法语的18岁数学分析天才，在他的父亲——以租界邮递员身份为掩护的中共地下党员壮烈牺牲后，误打误撞地身陷危险境地，稀里糊涂的成了上海滩谍报界呼风唤雨的人物，一时成为军统特别是日本特高科和汪伪特工竞相关注的焦点。在血雨腥风中，他在他父亲战友的帮助下，历经九死一生，终于成为一名坚定信仰共产主义的谍报专家！以传说中的妖怪们生活的share house为舞台，描绘了被最坏的前男友夺去一切、伤痕累累的主人公·目黑澪（小芝风花）坚强成长的恐怖喜剧。小澪所面临的麻烦和麻烦的对手，被超级多管闲事的妖怪们挖出，用过激的方式打倒。