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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.齐景浩、侯建白、云高洋是腾远乒乓球社的主力队员。由于成绩不佳，球社面临取消危机。球社社长齐景浩为重振腾远球社，学习“旋风球”，并邀请昔日对手厉圣加入。在历经各种挑战后，腾远球队终于向全国学院杯冠军奖杯发起冲刺。那不管来人是不是张家的玉米，事情都不好收拾。Some related concepts are described here first.