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此时，陈启和吕馨并肩坐着，各对着一个电脑屏幕。沿海小城，年轻警官杨家栋（井柏然 饰）初来乍到，恰遇城建委主任唐奕杰（张颂文 饰）坠楼身亡。杨家栋遂展开调查，发现唐奕杰坠楼案与和他过从甚密的紫金企业 负责人姜紫成（秦昊 饰），还有几年前紫金企业合伙人阿云（陈妍希 饰）失踪案都有着密切的关系。杨家栋调查中惨遭革职、追杀，一路逃往香港，途中与死者女儿小诺（马思纯 饰）意外邂逅，并在小诺的协助下继续追查，浑然不觉自己正落入一个纯情陷阱……3. I will not complain about the recommendation of books on in-depth learning. There are too many slots to spit. Save some effort and recommend books that are really suitable for novice readers at different stages.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.