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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.盟主不过是一个虚名，给刘邦便是了，有何不可。Network firewall: It is often located at the entrance or edge of the network, and is protected against the entrance of the network and serves the local LAN behind the firewall.缉毒警察骆翔在五年前的卧底行动中遇难假死，五年后改名换姓，冒充曾经的自己打入贩毒集团，在追求真相与面对自身命运的道路上冲破黑暗……英布道：说的不错，刘邦所倚重的就是洛水防线，依托洛水、伊水、邙山的地形地势，阻击我军。What is the meaning of life? This problem has undoubtedly become an unsolved ultimate problem.但，神话故事本来就是民间文学的一种，是远古时代人民的集体口头创作。