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"Genius" is the product of training//007The 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.身处其中，确实有些飘飘然，忘乎所以了。谁知才过了一天，就传来蕃国王城被攻陷的消息，紧跟着，就是蕃国被灭的消息，孔雀王都听傻了。Methodology is pieced together one by one in this way. After a long time, it can become its own methodology if it is systematized and systematized.