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The firewall sets the SYN forwarding timeout parameter (the firewall for state detection can be set in the state table), which is much less than the timeout time of the server. When the client sends the SYN packet and the server sends the acknowledgement packet (SYN + ACK), if the firewall has not received the acknowledgement packet (ACK) from the client by the time the counter expires, it sends the RST packet to the server to cause the server to delete the half connection from the queue. It is worth noting that the setting of gateway timeout parameters should not be too small or too large. If the setting of timeout parameters is too small, it will affect normal communication. If the setting is too large, it will also affect the effect of preventing SYN attacks. This parameter must be set according to the network application environment.In the second episode, Sheng Qing, a teacher from Fudan University's School of International Cultural Exchange, and Gu Chen, a lecturer in Chinese as a foreign language from Shanghai University's School of International Exchange, were invited to recall their college entrance examination experiences in 1987 and 1997 in the 10 and 20 years after 1977. This paper reviews and discusses the development process of major measures in recent years, such as the expansion of college enrollment, the reform of higher education, student loans, college-based general education, and the independent employment and entrepreneurship of college students.Some people think that the long-standing tension between regulatory authorities, public departments and financial institutions should at least bear part of the responsibility for network security accidents, because it is precisely because of this contradiction that enterprises often choose to make big things smaller and small things smaller.看见他，秦淼欣喜地招呼道：板栗哥哥，你回来了。Which chains can use the rules in the filter table: INPUT, FORWARD, OUTPUT你是……你是谁？童百熊定眼看着屋中女子，这个女子轮廓中和东方不败有着两三分相像。胡八一（阮经天饰）出国在即，整理旧物时翻出一张老照片。那时，他和胖子（刘潮饰）正作为知青在大兴安岭的山区插队。山里的生活让年轻气盛的他们如鱼得水，为了换几斤水果糖，上山打黄皮子（黄鼠狼），为了给人治病捉熊取胆，没想到二人误入一座坍塌的黄皮子祠。传说几十年前，一伙号称“泥儿会”的胡匪曾从黄皮子祠挖出一口描金嵌玉的箱子，随后这伙胡匪和箱子就一起消失在了漠北草原。