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是老将军。The other is a disguised ACK packet that responds to SYN-ACK to reach the server through firewall/proxy. This disguise prevents the TCB of the server from staying in the SYN-RECEIVED state, thus ensuring free space in the backlog queue. The firewall/proxy will stay and wait for a period of time. If the correct ACK of the connection initiator is not detected, it will pass through the disguised TCP? The RET message causes the server to release the TCB. For legitimate connections, packet flow can continue without the influence of firewalls/proxies. This method is more attractive than the above method of disguising SYN-ACK, because the firewall/agent does not need to directly participate in the connection after the legal connection is established.Read hirokiThe advantages of the state mode are as follows1. Any action taken to avoid collision shall be taken in accordance with the provisions of the Articles of this Chapter, and, if the circumstances permit at that time, shall be positive, carried out as early as possible and with full attention to the use of good ship skills.2017-07-22 15:41:2027, Organize activities to close the relationship between department personnel