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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.东来还在河北，没有消息。Russian Satellite Network Report Screenshot许负道：这就对了，我怀疑对方的真正目的可能是北门。但是，只见齐天大圣不喜反怒，仰天一声怒吼，声音桀骜暴躁，还有一丝凄厉悲伤。The enemy launched a powerful attack? Counterattack: To attack after evading the enemy's attack. After the successful counterattack, it will become invincible within a certain period of time.当晚，胡家大太太大闹灵堂，甩手不管丧事，胡家乱成一团。